CN101789216A - Drive control circuit of LED display module - Google Patents
Drive control circuit of LED display module Download PDFInfo
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- CN101789216A CN101789216A CN200910045865A CN200910045865A CN101789216A CN 101789216 A CN101789216 A CN 101789216A CN 200910045865 A CN200910045865 A CN 200910045865A CN 200910045865 A CN200910045865 A CN 200910045865A CN 101789216 A CN101789216 A CN 101789216A
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Abstract
The invention relates to a drive control circuit of an LED display module, comprising an EN control logic module, a common anode control module and a common cathode control module; the EN control logic module is connected with a current setting module; the current setting module is also connected with a reference source; the common anode control module is connected with a second current source; the common cathode control module is connected with a first current source; the drive control circuit also comprises an SEL (System Event Log) control logic module; one end of the SEL control logic module is connected with the common anode control module and the common cathode control module, and the other end thereof is connected with high electrical level or low electrical level or a PWM (Pulse-Width Modulation) end; and the current setting module is also connected with the second current source and the first current source. The invention has the advantages that common cathode drive and common anode drive are integrated in one chip, and the common cathode drive or the common anode drive or both common cathode drive and common anode drive are decided by the selection of the SEL control logic module.
Description
Technical field
The present invention relates to a kind of LED display module, relate in particular to a kind of Drive and Control Circuit of LED display module.
Background technology
The LED display module all manufactures common the moon or is total to positive connected mode in the prior art, and the chip for driving of corresponding LED all is can only drive the LED (as shown in Figure 1) of common sun connection or be total to the LED (as shown in Figure 2) that the moon connects.Therefore can produce following problem: 1) cloudy chip for driving can only drive the common cloudy led module that connects altogether, can not drive the led module that common sun connects.
Altogether the driver module of sun is generally by EN steering logic, electric current setting, reference source, sun control and second current source are formed altogether; In like manner, altogether cloudy driver module is generally by EN steering logic, electric current setting, reference source, cloudy control and first current source are formed altogether.
How designing a kind of control circuit that can drive common the moon, can drive common sun again is the problem that the technician will solve.
Summary of the invention
The technical issues that need to address of the present invention have provided a kind of Drive and Control Circuit of LED display module, are intended to solve the above problems.
In order to solve the problems of the technologies described above, the present invention is achieved by the following technical solutions:
The present invention includes: the EN steering logic; The EN steering logic connects the electric current setting, and the electric current setting also connects reference source; One is total to positive control linkage second current source; One is total to cloudy control linkage first current source; Second current source is held with VIN with first current source with being connected respectively; First current source also connects the anode of first diode in a group, second diode, the 3rd diode and the 4th diode respectively, the plus earth of first diode, second diode, the 3rd diode and the 4th diode; Second current source also connects the negative electrode of first diode, second diode, the 3rd diode and the 4th diode in another group respectively, and the anode of first diode, second diode, the 3rd diode and the 4th diode and Vcc end join; Also comprise: a SEL control logic module; One end of described SEL control logic module sun control together links to each other with cloudy control altogether, and the other end of SEL control logic module and high Horizon or low level or PWM hold and link to each other; Described electric current setting also links to each other with first current source with second current source.
Compared with prior art, the invention has the beneficial effects as follows: altogether cloudy drive and altogether sun drive and be integrated in the chip, it is common cloudy the driving or sun or drive or drive simultaneously cloudy altogether and sun altogether altogether that the selection by the SEL control logic module decides.
Description of drawings
Fig. 1 is the Drive and Control Circuit of the positive altogether LED of connection chip for driving in the prior art;
Fig. 2 is the Drive and Control Circuit of the cloudy altogether LED of connection chip for driving in the prior art;
Fig. 3 is a circuit diagram of the present invention;
Fig. 4 adopts the present invention to drive common sun to connect the LED control circuit;
Fig. 5 adopts the present invention to drive the common cloudy LED of connection control circuit;
Fig. 6 is that employing the present invention drives common the moon and the positive altogether LED control circuit that is connected simultaneously;
Fig. 7 is the SEL control logic module figure that adopts among the present invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is described in further detail:
By Fig. 3, Fig. 4, Fig. 5, Fig. 6 as seen: the present invention includes: the EN steering logic; The EN steering logic connects the electric current setting, and the electric current setting also connects reference source; One is total to positive control linkage second current source; One is total to cloudy control linkage first current source; Second current source is held with VIN with first current source with being connected respectively; First current source also connects the anode of the first diode D1 in a group, the second diode D2, the 3rd diode D3 and the 4th diode D4 respectively, the plus earth of the first diode D1, the second diode D2, the 3rd diode D3 and the 4th diode D4; Second current source also connects the negative electrode of the first diode D1, the second diode D2, the 3rd diode D3 and the 4th diode D4 in another group respectively, and the anode of the first diode D1, the second diode D2, the 3rd diode D3 and the 4th diode D4 and Vcc end join; Also comprise: a SEL control logic module; One end of described SEL control logic module sun control together links to each other with cloudy control altogether, and the other end of SEL control logic module and high Horizon or low level or PWM hold and link to each other; Described electric current setting also links to each other with first current source with second current source.
As seen from Figure 7: the SEL control logic module of the prior art that adopts among the present invention is one and adds a phase inverter by a Schmidt trigger and form, and output control simultaneously is cloudy control module and positive control module altogether altogether.
The present invention is at the simultaneously integrated the moon altogether of a chip and be total to two kinds of type of drive of sun, and its inner structure as shown in Figure 3.The EN pin is used for regulating the size of LED drive current, and the reference source module produces reference voltage and reference current, by electric current the size that module is determined current source 1 and current source 2 is set then.And the function of SEL control logic module, common cloudy control module and common positive control module is that current source 1 and current source 2 are made a choice.When selecting current source 1, chip can drive the common cloudy led module that connects; When selecting current source 2, this chip can be used to drive the led module that common sun connects.
When SEL connect low level, signal was selected in the output of SEL control logic module, opens common positive control module and current source 2, turns off common cloudy control module and current source 1, and chip just can drive the positive altogether LED (as Fig. 4) that connects like this.
When SEL connect high level, signal was selected in the output of SEL control logic module, opens common cloudy control module and current source 1, turns off common positive control module and current source 2, and chip just can drive the cloudy altogether LED (as Fig. 5) that connects like this.
Another one of the present invention is used: when SEL input pwm signal, can drive common the moon simultaneously and be total to the led module that sun is connected.Principle is: when SEL pin input pwm signal, cloudy altogether LED and positive altogether LED are alternate conduction, but because the pwm signal frequency is higher, generally all more than several KHz, naked eyes can not discovered the shutoff of LED, have therefore reached to drive the cloudy altogether function of positive led module altogether simultaneously.
Claims (1)
1. the Drive and Control Circuit of a LED display module comprises: the EN steering logic; The EN steering logic connects the electric current setting, and the electric current setting also connects reference source; One is total to positive control linkage second current source; One is total to cloudy control linkage first current source; Second current source is held with VIN with first current source with being connected respectively; First current source also connects the anode of the first diode D1 in a group, the second diode D2, the 3rd diode D3 and the 4th diode D4 respectively, the plus earth of the first diode D1, the second diode D2, the 3rd diode D3 and the 4th diode D4; Second current source also connects the negative electrode of the first diode D1, the second diode D2, the 3rd diode D3 and the 4th diode D4 in another group respectively, and the anode of the first diode D1, the second diode D2, the 3rd diode D3 and the 4th diode D4 and Vcc end join; It is characterized in that also comprising: a SEL control logic module; One end of described SEL control logic module sun control together links to each other with cloudy control altogether, and the other end of SEL control logic module and high Horizon or low level or PWM hold and link to each other; Described electric current setting also links to each other with first current source with second current source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910045865A CN101789216A (en) | 2009-01-23 | 2009-01-23 | Drive control circuit of LED display module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910045865A CN101789216A (en) | 2009-01-23 | 2009-01-23 | Drive control circuit of LED display module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101789216A true CN101789216A (en) | 2010-07-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910045865A Pending CN101789216A (en) | 2009-01-23 | 2009-01-23 | Drive control circuit of LED display module |
Country Status (1)
| Country | Link |
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| CN (1) | CN101789216A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112382231A (en) * | 2020-11-12 | 2021-02-19 | 东莞阿尔泰显示技术有限公司 | Adapter plate compatible with common cathode lamp panel and common anode lamp panel |
| TWI834387B (en) * | 2022-01-06 | 2024-03-01 | 聯詠科技股份有限公司 | Driving circuit for led panel and led panel thereof |
-
2009
- 2009-01-23 CN CN200910045865A patent/CN101789216A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112382231A (en) * | 2020-11-12 | 2021-02-19 | 东莞阿尔泰显示技术有限公司 | Adapter plate compatible with common cathode lamp panel and common anode lamp panel |
| TWI834387B (en) * | 2022-01-06 | 2024-03-01 | 聯詠科技股份有限公司 | Driving circuit for led panel and led panel thereof |
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Open date: 20100728 |