CN202422683U - Drive circuit for cell board of LED (Light Emitting Diode) display screen - Google Patents
Drive circuit for cell board of LED (Light Emitting Diode) display screen Download PDFInfo
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- CN202422683U CN202422683U CN2011205185701U CN201120518570U CN202422683U CN 202422683 U CN202422683 U CN 202422683U CN 2011205185701 U CN2011205185701 U CN 2011205185701U CN 201120518570 U CN201120518570 U CN 201120518570U CN 202422683 U CN202422683 U CN 202422683U
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Abstract
The utility model discloses a drive circuit for a cell board of an LED (Light Emitting Diode) display screen, comprising a power interface, a plurality of drive chips connected in parallel, a data interface, a data buffer and MOS (Metal Oxide Semiconductor) transistors, wherein a plurality of LEDs are connected to a control end of each drive chip in parallel; the data interface is used for inputting the display data of the LED display screen; the data buffer is used for outputting an output display signal, a clock signal and a latch signal which are output by the data interface to each driving chip in a buffering way and outputting a row control signal output by the data interface to the MOS transistor; the input end of the data buffer is connected to the output end of the data interface; the output end of the data buffer is connected to each drive chip and each MOS transistor; a collector electrode is connected to a direct current power output end of the power interface; a grid electrode is connected to the output end of the data buffer, for outputting the row control signal; and an emitter electrode is connected to the MOS transistor of each LED. The drive circuit provided by the utility model meets the requirements of low electromagnetic radiation and has the advantages of simplicity in circuit structure and low realization cost.
Description
Technical field
The utility model relates to a kind of driving circuit, especially relates to the driving circuit of low electromagnetic in a kind of LED display cell board.
Background technology
Light emitting diode (LED; Light Emitting Diode), be a kind of solid-state semiconductor devices, it can directly be converted into light to electricity; Owing to possess high illumination efficiency, long-lasting and small size, LED has obtained application more and more widely.The white light LEDs of the low-power consumption of about 0.1W just is being widely used on the backlight and keyboard illumination of light emitting diode LCD display panel at present, also can bring higher brightness as application such as temporary lighting or flashlamp through connecting many LEDs certainly.The High Power LED LED of 1W then is applied in camera function or the home-use illumination of supporting in the high-resolution shooting mobile phone in the dark surrounds.Except that white light LEDs, RGB (red, green, blue) light LED also often is used to strengthen color sense, and accurately suitably mixed through three kinds of colors, RGB (red, green, blue) light LED can create rich and varied color.
The application of LED more and more widely, simultaneously the type of drive of LED is also more and more abundanter.Existing nowadays, high refresh rate, high gray scale, high brightness etc. are all pursued in order to cater to market by numerous LED display manufacturer.This has just caused the drive circuit works frequency of LED display higher, thereby causes very strong electromagnetic interference (EMI), has increased the inhibition difficulty of Electro Magnetic Compatibility (EMC, Electro Magnetic Compatibility).
The utility model content
To the higher apparent in view shortcoming of electromagnetic interference (EMI) that causes of the drive circuit works frequency of traditional LED display, the utility model proposes the driving circuit of low electromagnetic in a kind of LED display cell board.
The utility model adopts following technical scheme to realize: the driving circuit of low electromagnetic in a kind of LED display cell board, and it comprises: power interface; The chip for driving of a plurality of parallel connections, the control end of each chip for driving a plurality of LED that are connected in parallel; Be used to import the data-interface of LED display video data; Be used for output shows signal, clock signal and the latch signal buffering of data-interface output are exported to each chip for driving, will control the data buffer that letter export metal-oxide-semiconductor to according to the row of interface output, output terminal, output terminal that its input end connects data-interface connect each chip for driving and metal-oxide-semiconductor respectively; Collector connects the dc power output end of power interface, the output terminal that grid connection data buffer is used to export row control letter, the metal-oxide-semiconductor that emitter connects each LED.
Wherein, be connected in series current-limiting resistance between the output terminal of the output terminal of data-interface and data buffer.
Wherein, be connected in series filter capacitor between the output terminal of data-interface and the signal ground.
Wherein, connect each chip for driving behind the dc power output end of the power interface serial connection schottky diode.
Wherein, between the anode of schottky diode and signal ground, be connected filter capacitor.
Wherein, said driving circuit is arranged between the multi-layer PCB board, and the top layer of this pcb board and bottom all select to be set to the stratum, and stratum and signal ground are through the electric capacity bridge joint, and the stratum connects the cabinet shell of LED display cell board.
Compared with prior art, the utlity model has following beneficial effect:
The utility model in driving circuit, used highly refresh, the LED chip for driving of high gray shade scale; Guaranteeing under the high prerequisite that refreshes with high gray scale; Reduced clock signal frequency as far as possible, selected suitable magnetic bead, resistance and electric capacity that signal is carried out filtering reduction noise to the unlike signal circuit through calculating and testing; And data buffer is selected 74VHC245 for use, and the voltage of its output does not receive the influence of IC supply voltage, and electromagnetic radiation is quite low; In the circuit board at driving circuit place, select to be set to the stratum in top layer and the bottom floor file, stratum and signal ground cause the LED cabinet shell with the stratum then through the electric capacity bridge joint, can reduce the electromagnetic exposure that driving circuit produces.Therefore, the driving circuit of the utility model has reached the requirement of low electromagnetic, and have circuit structure simple, realize the low advantage of cost.
Description of drawings
Fig. 1 is the circuit diagram of the utility model.
Embodiment
As shown in Figure 1; The utility model proposes the driving circuit of low electromagnetic in a kind of LED display cell board; This driving circuit comprises: the data-interface J1 that is used to import the LED display video data; Its 4 output terminals are connected in series respectively exports shows signal (SIGNAL), clock signal (CLK), latch signal (SDI) and row control signal (ROWGATE) behind current-limiting resistance R1, R2, R3 and the R4 respectively to data buffer U1, and 4 current-limiting resistance R1, R2, R3 and R4 are connected signal ground after being connected in series 4 filter capacitor C1, C2, C3 and C4 respectively; It is the chip of 74VHC245 that impact damper U1 adopts model; After shows signal (SIGNAL), clock signal (CLK), row control signal (SDI) and latch signal (ROWGATE) cushioned respectively; Its 3 output terminals will show that respectively signal (SIGNAL), clock signal (CLK) and latch signal (SDI) export the LED array of display to, and in addition 1 output terminal will be gone control signal (ROWGATE) and exported the grid of metal-oxide-semiconductor U2 to; Cooperate with row control signal (ROWGATE) controlling by metal-oxide-semiconductor U2 from the LED power supply of power interface J2 output.
Wherein, the LED array of display comprises several parallelly connected chip for driving U3 .., Un, the control end of each LED chip for driving several LEDs that are connected in parallel.
Wherein, power interface J2 has 4 output terminals, and its dc power output end output 5V direct supply is to the collector of metal-oxide-semiconductor U2, and emitter connects the anode of each LED in the LED array of display.When row control signal (ROWGATE) was high level, metal-oxide-semiconductor U2 conducting made the 5V direct supply of power interface J2 output power supply is provided for each LED, makes each LED luminous.
In addition, because each chip for driving U3 .., Un are adopted different voltage branch feedings, thus connect each chip for driving U3 .., Un behind diode D1 of the 5V dc power output end of power interface J2 serial connection, and diode D1 selects schottky diode for use.Between the anode of schottky diode D1 and signal ground, be connected filter capacitor C2.Form coupling path owing to producing distributed capacitance between the big pressure reduction circuit, so select schottky diode (about step-down 0.3V).
And; The LED display cell board is handled when the PCB layout; In the multi-layer PCB at driving circuit place, top layer and bottom select to be set to the stratum, and stratum and signal ground are through the electric capacity bridge joint; And the stratum connects the cabinet shell of LED display cell board, can reduce the electromagnetic exposure that driving circuit produces with this.
To sum up; The utility model in driving circuit, used highly refresh, the LED chip for driving of high gray shade scale; Guaranteeing under the high prerequisite that refreshes with high gray scale; Reduced clock signal frequency as far as possible, selected suitable magnetic bead, resistance and electric capacity that signal is carried out filtering reduction noise to the unlike signal circuit through calculating and testing; And data buffer is selected 74VHC245 for use, and the voltage of its output does not receive the influence of IC supply voltage, and electromagnetic radiation is quite low.Therefore, the driving circuit of the utility model has reached the requirement of low electromagnetic.
The above is merely the preferred embodiment of the utility model; Not in order to restriction the utility model; Any modification of being done within all spirit and principles at the utility model, be equal to replacement and improvement etc., all should be included within the protection domain of the utility model.
Claims (6)
1. LED display cell board driving circuit is characterized in that said driving circuit comprises:
Power interface;
The chip for driving of a plurality of parallel connections, the control end of each chip for driving a plurality of LED that are connected in parallel;
Be used to import the data-interface of LED display video data;
Be used for output shows signal, clock signal and the latch signal buffering of data-interface output are exported to each chip for driving, will control the data buffer that letter export metal-oxide-semiconductor to according to the row of interface output, output terminal, output terminal that its input end connects data-interface connect each chip for driving and metal-oxide-semiconductor respectively;
Collector connects the dc power output end of power interface, the output terminal that grid connection data buffer is used to export row control letter, the metal-oxide-semiconductor that emitter connects each LED.
2. according to the said a kind of LED display cell board driving circuit of claim 1, it is characterized in that, be connected in series current-limiting resistance between the output terminal of data-interface and the output terminal of data buffer.
3. according to claim 1 or 2 said a kind of LED display cell board driving circuits, it is characterized in that, be connected in series filter capacitor between the output terminal of data-interface and the signal ground.
4. according to the said a kind of LED display cell board driving circuit of claim 1, it is characterized in that, connect each chip for driving behind the dc power output end serial connection schottky diode of power interface.
5. according to the said a kind of LED display cell board driving circuit of claim 4, it is characterized in that, between the anode of schottky diode and signal ground, be connected filter capacitor.
6. according to the said a kind of LED display cell board driving circuit of claim 1; It is characterized in that; Said driving circuit is arranged between the multi-layer PCB board; The top layer of this pcb board and bottom all select to be set to the stratum, and stratum and signal ground are through the electric capacity bridge joint, and the stratum connects the cabinet shell of LED display cell board.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205185701U CN202422683U (en) | 2011-12-13 | 2011-12-13 | Drive circuit for cell board of LED (Light Emitting Diode) display screen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205185701U CN202422683U (en) | 2011-12-13 | 2011-12-13 | Drive circuit for cell board of LED (Light Emitting Diode) display screen |
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| Publication Number | Publication Date |
|---|---|
| CN202422683U true CN202422683U (en) | 2012-09-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011205185701U Expired - Fee Related CN202422683U (en) | 2011-12-13 | 2011-12-13 | Drive circuit for cell board of LED (Light Emitting Diode) display screen |
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| CN (1) | CN202422683U (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103531144A (en) * | 2013-07-18 | 2014-01-22 | 邯郸市天之虹光电科技有限公司 | Wireless control full color LED display screen |
| CN105047091A (en) * | 2015-07-31 | 2015-11-11 | 苏州南光电子科技有限公司 | LED display screen lamp bar |
| CN105304017A (en) * | 2015-10-26 | 2016-02-03 | 惠州市德赛智能科技有限公司 | Circuit for improving electromagnetic compatibility of LED display screen |
| CN105489160A (en) * | 2016-01-12 | 2016-04-13 | 深圳市奥拓电子股份有限公司 | Data transmission device, data transmission method and system of LED display screen |
| US10248372B2 (en) | 2013-12-31 | 2019-04-02 | Ultravision Technologies, Llc | Modular display panels |
| US10373535B2 (en) | 2013-12-31 | 2019-08-06 | Ultravision Technologies, Llc | Modular display panel |
| US10706770B2 (en) | 2014-07-16 | 2020-07-07 | Ultravision Technologies, Llc | Display system having module display panel with circuitry for bidirectional communication |
| US10891881B2 (en) | 2012-07-30 | 2021-01-12 | Ultravision Technologies, Llc | Lighting assembly with LEDs and optical elements |
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2011
- 2011-12-13 CN CN2011205185701U patent/CN202422683U/en not_active Expired - Fee Related
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10891881B2 (en) | 2012-07-30 | 2021-01-12 | Ultravision Technologies, Llc | Lighting assembly with LEDs and optical elements |
| CN103531144A (en) * | 2013-07-18 | 2014-01-22 | 邯郸市天之虹光电科技有限公司 | Wireless control full color LED display screen |
| US10540917B2 (en) | 2013-12-31 | 2020-01-21 | Ultravision Technologies, Llc | Modular display panel |
| US10248372B2 (en) | 2013-12-31 | 2019-04-02 | Ultravision Technologies, Llc | Modular display panels |
| US10373535B2 (en) | 2013-12-31 | 2019-08-06 | Ultravision Technologies, Llc | Modular display panel |
| US10380925B2 (en) | 2013-12-31 | 2019-08-13 | Ultravision Technologies, Llc | Modular display panel |
| US10410552B2 (en) | 2013-12-31 | 2019-09-10 | Ultravision Technologies, Llc | Modular display panel |
| US10741107B2 (en) | 2013-12-31 | 2020-08-11 | Ultravision Technologies, Llc | Modular display panel |
| US10871932B2 (en) | 2013-12-31 | 2020-12-22 | Ultravision Technologies, Llc | Modular display panels |
| US10706770B2 (en) | 2014-07-16 | 2020-07-07 | Ultravision Technologies, Llc | Display system having module display panel with circuitry for bidirectional communication |
| CN105047091A (en) * | 2015-07-31 | 2015-11-11 | 苏州南光电子科技有限公司 | LED display screen lamp bar |
| CN105304017A (en) * | 2015-10-26 | 2016-02-03 | 惠州市德赛智能科技有限公司 | Circuit for improving electromagnetic compatibility of LED display screen |
| CN105489160A (en) * | 2016-01-12 | 2016-04-13 | 深圳市奥拓电子股份有限公司 | Data transmission device, data transmission method and system of LED display screen |
| CN105489160B (en) * | 2016-01-12 | 2018-07-17 | 深圳市奥拓电子股份有限公司 | A kind of data transmission device of LED display, data transmission method and system |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120905 Termination date: 20181213 |
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| CF01 | Termination of patent right due to non-payment of annual fee |