CN105304017A - Circuit for improving electromagnetic compatibility of LED display screen - Google Patents
Circuit for improving electromagnetic compatibility of LED display screen Download PDFInfo
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- CN105304017A CN105304017A CN201510699626.0A CN201510699626A CN105304017A CN 105304017 A CN105304017 A CN 105304017A CN 201510699626 A CN201510699626 A CN 201510699626A CN 105304017 A CN105304017 A CN 105304017A
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- led display
- circuit
- data buffer
- led
- electro magnetic
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Abstract
The invention discloses a circuit for improving electromagnetic compatibility of an LED display screen, which comprises an LED driving circuit, multiple LED display units, and a data buffer, wherein the data buffer is connected between the LED driving circuit and the LED display units; the multiple LED display units are divided into at least two groups; and the data buffer is used for processing signals of the LED driving circuit and outputting the processed signals to different groups of LED display units at a time T interval. Through arranging the data buffer between the LED driving circuit and the LED display units, the LED display units can perform grouped display, over large transient electromagnetic radiation can be avoided, safety of an electronic product is ensured, and electromagnetic compatibility is improved.
Description
Technical field
The present invention relates to LED display circuit engineering field, particularly relate to a kind of circuit improving LED display Electro Magnetic Compatibility.
Background technology
Along with various key activities and place are to the extensive use of LED display, LED display has penetrated into each corner of people's daily life.Along with the lifting of quality of life, consumer is when buying the electronic product such as LED display except paying close attention to the general usability of product, and what more and more pay attention to is the harm that electromagnetic radiation that electronic product produces brings human body.And one of them important parameter weighing display screen radiation level is Electro Magnetic Compatibility (EMC, ElectroMagneticCompatibility), EMC refers to that equipment or system meet the requirements in its electromagnetic environment and runs the ability of intolerable electromagnetic interference (EMI) of not producing any equipment in its environment.Improve EMC performance and can reduce electromagnetic radiation, improve the security performance of electronic product.At present, large to the design difficulty of Electro Magnetic Compatibility, design cost is high.
Summary of the invention
Fundamental purpose of the present invention is to provide a kind of circuit improving LED display Electro Magnetic Compatibility, is intended to the electromagnetic radiation reducing LED display, improves the security performance of electronic product.
For achieving the above object, the invention provides a kind of circuit improving LED display Electro Magnetic Compatibility, comprise LED drive circuit and multiple LED display unit, the circuit of described raising LED display Electro Magnetic Compatibility also comprises data buffer, described data buffer is connected between LED drive circuit and LED display unit, described multiple LED display unit is divided at least two groups, the alternate time T of signal after process for the treatment of the signal of LED drive circuit, and is exported to the LED display unit of different group by described data buffer.
Preferably, the output of LED drive circuit is connected with the input of data buffer, the output of data buffer is connected with LED display unit, and the output of described LED drive circuit and the output of described data buffer include serial data clock signal, enable signal, latch signal.
Preferably, described T scope is 10-20ns.
Preferably, the model of described data buffer is 74HC245.
Preferably, the input port of described 74HC245 comprises A1-A8, and the output port of described 74HC245 comprises B1-B8.
Preferably, the DIR port of described 74HC245 connects power supply, the non-port ground connection of OE.
Preferably, the equal ground connection of remaining 74HC245 input port be not connected with LED drive circuit.
The present invention, by setting data impact damper between LED drive circuit and LED display unit, makes LED display unit can divide into groups to show, moment electromagnetic radiation can be avoided excessive, ensure the security of electronic product, improve Electro Magnetic Compatibility.
Accompanying drawing explanation
Fig. 1 is the schematic diagram that the present invention improves circuit one embodiment of LED display Electro Magnetic Compatibility;
Fig. 2 is the circuit theory diagrams of Fig. 1.
The realization of the object of the invention, functional characteristics and advantage will in conjunction with the embodiments, are described further with reference to accompanying drawing.
Embodiment
Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
The invention provides a kind of circuit improving LED display Electro Magnetic Compatibility, see figures.1.and.2, in one embodiment, the circuit of this raising LED display Electro Magnetic Compatibility, comprise LED drive circuit and multiple LED display unit, the circuit of described raising LED display Electro Magnetic Compatibility also comprises data buffer, described data buffer is connected between LED drive circuit and LED display unit, described multiple LED display unit is divided at least two groups, described data buffer is for the treatment of the signal of LED drive circuit, and the alternate time T of signal after process is exported to the LED display unit of different group, described T>0.
The present invention, by setting data impact damper between LED drive circuit and LED display unit, makes LED display unit can divide into groups to show, moment electromagnetic radiation can be avoided excessive, ensure the security of electronic product, improve Electro Magnetic Compatibility.
The output of LED drive circuit is connected with the input of data buffer, the output of data buffer is connected with LED display unit, and the output of described LED drive circuit and the output of described data buffer include serial data clock signal, enable signal, latch signal; Described T scope (comprises 10ns and 20ns) between 10-20ns, can ensure that LED display normally shows, and avoids occurring that the picture of display is imperfect, or some pictures show, but the problem that part picture does not also show; The model of described data buffer is 74HC245, and input port comprises A1-A8, and output port comprises B1-B8, and the equal ground connection of remaining 74HC245 input port be not connected with LED drive circuit, DIR port connects power supply, the non-port ground connection of OE; LED display unit is the base unit of composition LED display.In the present embodiment, have employed 3 pieces of 74HC245 and 6 piece LED display units, LED display unit is divided into two groups, LED display unit 1-3 is first group, LED display unit 2-6 is second group, 74HC245 is first by signal OE1 ~ OE3, LAT1 ~ LAT3 and CLK1 ~ CLK3 first outputs to first group of display, and when interval 10-20ns by signal OE4 ~ OE6, LAT4 ~ LAT6 and CLK4 ~ CLK6 outputs to second group of display, radiation peak between group can be staggered like this, reduce the electromagnetic radiation of LED display unit, time simultaneously due to interval display is shorter, naked eyes cannot identification, do not affect the effect of display.
These are only the preferred embodiments of the present invention; not thereby the scope of the claims of the present invention is limited; every utilize instructions of the present invention and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (7)
1. one kind is improved the circuit of LED display Electro Magnetic Compatibility, comprise LED drive circuit and multiple LED display unit, it is characterized in that, the circuit of described raising LED display Electro Magnetic Compatibility also comprises data buffer, described data buffer is connected between LED drive circuit and LED display unit, described multiple LED display unit is divided at least two groups, the alternate time T of signal after process for the treatment of the signal of LED drive circuit, and is exported to the LED display unit of different group by described data buffer.
2. the circuit improving LED display Electro Magnetic Compatibility as claimed in claim 1, it is characterized in that, the output of LED drive circuit is connected with the input of data buffer, the output of data buffer is connected with LED display unit, and the output of described LED drive circuit and the output of described data buffer include serial data clock signal, enable signal, latch signal.
3. the circuit improving LED display Electro Magnetic Compatibility as claimed in claim 1, it is characterized in that, described T scope is 10-20ns.
4. the circuit improving LED display Electro Magnetic Compatibility as claimed in claim 1, it is characterized in that, the model of described data buffer is 74HC245.
5. the circuit improving LED display Electro Magnetic Compatibility as claimed in claim 4, it is characterized in that, the input port of described 74HC245 comprises A1-A8, and the output port of described 74HC245 comprises B1-B8.
6. the circuit improving LED display Electro Magnetic Compatibility as claimed in claim 4, is characterized in that, the DIR port of described 74HC245 connects power supply, the non-port ground connection of OE.
7. the circuit improving LED display Electro Magnetic Compatibility as claimed in claim 5, is characterized in that, the equal ground connection of remaining 74HC245 input port be not connected with LED drive circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510699626.0A CN105304017A (en) | 2015-10-26 | 2015-10-26 | Circuit for improving electromagnetic compatibility of LED display screen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510699626.0A CN105304017A (en) | 2015-10-26 | 2015-10-26 | Circuit for improving electromagnetic compatibility of LED display screen |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105304017A true CN105304017A (en) | 2016-02-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510699626.0A Pending CN105304017A (en) | 2015-10-26 | 2015-10-26 | Circuit for improving electromagnetic compatibility of LED display screen |
Country Status (1)
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| CN (1) | CN105304017A (en) |
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| JP2003233358A (en) * | 2002-02-12 | 2003-08-22 | Hitachi Ltd | Liquid crystal driver and liquid crystal display device |
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| CN101466186A (en) * | 2008-12-31 | 2009-06-24 | 张家瑞 | Drive method and drive device capable of regulating high-power LED lighteness |
| CN101561998A (en) * | 2008-04-14 | 2009-10-21 | 北京京东方光电科技有限公司 | Method and device for processing data of liquid crystal display |
| US20100194737A1 (en) * | 2005-09-26 | 2010-08-05 | Renesas Technology Corp. | Display control/drive device and display system |
| CN202422683U (en) * | 2011-12-13 | 2012-09-05 | 深圳市艾比森光电股份有限公司 | Drive circuit for cell board of LED (Light Emitting Diode) display screen |
| CN102760402A (en) * | 2011-04-25 | 2012-10-31 | 康佳集团股份有限公司 | Signal interface circuit of LED (light-emitting diode) module and LED display device |
| US20140203855A1 (en) * | 2011-12-21 | 2014-07-24 | Samsung Electronics Co., Ltd. | Gate line driver capable of controlling slew rate thereof |
| CN205038948U (en) * | 2015-10-26 | 2016-02-17 | 惠州市德赛智能科技有限公司 | Improve LED display screen electromagnetic compatibility's circuit |
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2015
- 2015-10-26 CN CN201510699626.0A patent/CN105304017A/en active Pending
Patent Citations (10)
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| KR100669095B1 (en) * | 1999-12-28 | 2007-01-16 | 엘지.필립스 엘시디 주식회사 | Data Transmitting/Receiving Method and Apparatus, and Liquid Crystal Display and Driving Method thereof |
| JP2003208131A (en) * | 2002-01-15 | 2003-07-25 | Toshiba Corp | Planar display device |
| JP2003233358A (en) * | 2002-02-12 | 2003-08-22 | Hitachi Ltd | Liquid crystal driver and liquid crystal display device |
| US20100194737A1 (en) * | 2005-09-26 | 2010-08-05 | Renesas Technology Corp. | Display control/drive device and display system |
| CN101561998A (en) * | 2008-04-14 | 2009-10-21 | 北京京东方光电科技有限公司 | Method and device for processing data of liquid crystal display |
| CN101466186A (en) * | 2008-12-31 | 2009-06-24 | 张家瑞 | Drive method and drive device capable of regulating high-power LED lighteness |
| CN102760402A (en) * | 2011-04-25 | 2012-10-31 | 康佳集团股份有限公司 | Signal interface circuit of LED (light-emitting diode) module and LED display device |
| CN202422683U (en) * | 2011-12-13 | 2012-09-05 | 深圳市艾比森光电股份有限公司 | Drive circuit for cell board of LED (Light Emitting Diode) display screen |
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Application publication date: 20160203 |
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