CN104978928A - LED display screen and driving circuit thereof - Google Patents
LED display screen and driving circuit thereof Download PDFInfo
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- CN104978928A CN104978928A CN201510373182.1A CN201510373182A CN104978928A CN 104978928 A CN104978928 A CN 104978928A CN 201510373182 A CN201510373182 A CN 201510373182A CN 104978928 A CN104978928 A CN 104978928A
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Abstract
The invention discloses an LED display screen and a driving circuit of the LED display screen. The LED display screen comprises a screen body, a controller and an upper computer; video information is transmitted to the controller through the upper computer, and after being coded and decoded through the controller, the video information is transmitted to the screen body to be displayed. The driving circuit comprises LED lamps and driving chips, a display unit is composed of the three driving chips and three LED lamp sets, one set of LED lamps are driven by one driving chip, and the three sets of LED lamps comprise one set of red LED lamps, one set of green LED lamps and one set of blue LED lamps; and each signal output pin of the driving chips is connected with one cascade LED lamp set, and a resistor is connected between the set of cascade red LED lamps and a power source in series. The resistor is connected to the red LED lamp set in series, the voltage parting effect is effectively achieved, impact on the red LED lamps is reduced, the service life is prolonged, and occurrence of the dead point rate is effectively reduced.
Description
Technical field
The invention belongs to electronics applications field, be specifically related to a kind of LED display and driving circuit thereof.
Background technology
LED display (LED panel): LED is exactly light emitting diode, the english abbreviation of light emitting diode, is called for short LED.It is a kind of display mode by controlling semiconductor light-emitting-diode, and its general appearance is exactly be made up of a lot of individual normally red light emitting diode, and the light on and off by lamp show character.Be used for showing the display screen of the various information such as word, figure, image, animation, market, video, video signal.Shenzhen is LED display development & production origin.The manufacturer of current Shenzhen LED display reaches ten thousand, wherein auspicious by Ai Bisen, light, in the leading eldest child such as auspicious, follow-up also have Shenzhen unexpected rival's attitudes such as bright, extra large lamp, continent be bright to be for a long time shortlisted for top ten, and famous brand company price general charged is higher, and mainly handling cost is higher than general enterprises.Current LED display price is rather transparent.
Compared with other giant-screen terminal display, LED display mainly contains following characteristics:
1, brightness is high: the brightness of outdoor LED display screen is greater than 8000mcd/m2, is at present uniquely can the large-scale display terminal of round-the-clock use out of doors; The brightness of indoor LED display is greater than 2000md/m2.
2, the life-span is long: the LED life-span reaches 100, and more than 000 hour (10 years), this parameter generally all refers to designed life, and brightness is dark also calculates.
3, visual angle is large: indoor visual angle can be greater than 160 degree, and outdoor visual angle can be greater than 120 degree.The size at visual angle depends on the shape of LED light emitting diode.
4, screen area is changeable, little of less than a square meter, greatly then can reach hundreds of, thousands of square meter; 5, easy and computer interface, support software enriches.
Application number is 201310629925.8, the applying date be on Dec 2nd, 2013 Guangdong Weichuang Shixun Science and Technology Co., Ltd disclose a kind of LED display driving circuit, it comprises LED and constant current source, the LED of one or more constant current source and respective amount is packaged together and forms integrated lamp group, constant current source in lamp group and LED are electrically connected in the proportioning mode of 1:1, also be packaged with a constant current source controller be connected with one or more constant current source in lamp group, this constant current source controller is provided with external interface.In this invention, the LED of one or more constant current source and respective amount and constant current source controller are packaged together and form integrated lamp group, one or more LED and one or more constant current source is contained in lamp group, encapsulation degree is high, multiple lamp group together just can highdensity LED display, makes this invention can be applicable to high density LED display.
Above-mentioned patent solves the application of high density LED display, but, the maximum voltage born due to red LED lamp and working current and blue, green LED lamp is inconsistent, therefore, adopt above-mentioned driving circuit, easily cause red LED lamp short for serviceable life, the phenomenon at easy dead point.
Summary of the invention
Technical matters to be solved by this invention is: provide a kind of LED display driving circuit, solves three kinds of inconsistent phenomenons causing dead point of color LED operating voltage in prior art.
The present invention is for solving the problems of the technologies described above by the following technical solutions:
A kind of LED display driving circuit, comprise LED and driving chip, three driving chip and three groups of LED form a display unit, each driving chip drives one group of LED, three groups of LED are respectively one group of red LED lamp, one group of green LED lamp, one group of blue led lamp, each signal output pin of driving chip is respectively connected with a LED group of connecting, the red LED lamp of each group series connection and a resistance of all connecting between power supply, the power input port of each display unit connects rc filter circuit.
Described driving chip comprises 8 or 16 drive singal output pins, control signal input pin, control signal output pin, sheets select input pin, latch signal pin, a clock signal pin, wherein, the control signal input pin of three driving chip, output pin are sequentially connected in series.
Described LED is paster LED lamp or plug-in unit LED.
The resistance of described resistance is 50 Europe, Europe ~ 100.
A kind of LED display, comprise screen body, controller, host computer, wherein, screen body comprises several casings, and each casing comprises multiple module, and each module comprises organizes display unit more, by connecting and/or being connected in parallel between display unit, by host computer, video information is sent to controller, controller, to after video information encoding and decoding, is sent to screen body and shows.
The central processing unit of described controller adopts fpga chip.
The central processing unit of described controller adopts the one in the Spartan-6 family chip of Xilinx company.
Described driving chip is MBI5024 or MBI5167 that scientific & technical corporation is built up in Taiwan.
Compared with prior art, the present invention has following beneficial effect:
1, by a resistance of connecting in red LED lamp set, effectively play the effect of dividing potential drop, and be all connected with rc filter circuit in the power input port of each display unit, filter out power is disturbed, reduce the impact to red LED lamp, increase serviceable life, effectively reduce the generation of dead point rate.
The resistance of 2, connecting between 50 Europe, Europe ~ 100, effectively can play the effect of dividing potential drop, does not affect the brightness of normal red LED lamp simultaneously.
3, MBI5024 chip is that a performance that accumulation science and technology in Taiwan controls to release for LED display is specially high, the chip that cost is low, and the LED display control for the type can realize its display demand, reduces the cost of whole screen simultaneously.
Accompanying drawing explanation
Fig. 1 is driving circuit figure of the present invention.
Embodiment
Below in conjunction with accompanying drawing, structure of the present invention and the course of work are described further.
As shown in Figure 1, a kind of LED display driving circuit, comprise LED and driving chip, three driving chip and three groups of LED form a display unit, each driving chip drives one group of LED, three groups of LED are respectively one group of red LED lamp, one group of green LED lamp, one group of blue led lamp, each signal output pin of driving chip is respectively connected with a LED group of connecting, the red LED lamp of each group series connection and a resistance of all connecting between power supply, the power input port of each display unit connects rc filter circuit.
Described driving chip comprises 8 or 16 drive singal output pins, control signal input pin, control signal output pin, sheets select input pin, latch signal pin, a clock signal pin, wherein, the control signal input pin of three driving chip, output pin are sequentially connected in series.
Described LED is paster LED lamp or plug-in unit LED.
The resistance of described resistance is 50 Europe, Europe ~ 100.
A kind of LED display, comprise screen body, controller, host computer, wherein, screen body comprises several casings, and each casing comprises multiple module, and each module comprises organizes display unit more, by connecting and/or being connected in parallel between display unit, by host computer, video information is sent to controller, controller, to after video information encoding and decoding, is sent to screen body and shows.
The central processing unit of described controller adopts fpga chip.
The central processing unit of described controller adopts the one in the Spartan-6 family chip of Xilinx company.
Described driving chip is MBI5024 or MBI5167 that scientific & technical corporation is built up in Taiwan.
The present embodiment adopts the XC6SLX16 chip in the Spartan-6 family chip of Xilinx company, as primary processor, its feature is described:
series not only has leading system integration ability, can also realize the minimum total cost being applicable to high volume applications simultaneously.This series is by 13 member compositions, and available density is not from 3840 logical blocks to 147443 logical blocks etc.Compared with previous generation Spartan series, this serial power consumption be only its 50%, and speed is faster, linkage function is more comprehensively abundant.Spartan-6 series adopts the manufacture of ripe 45nm low-power consumption copper wiring technology, the perfection achieving cost performance and power consumption balances, brand-new and more efficient pair register 6 can be provided to input look-up table (LUT) logic and a series of abundant built-in system level module, comprising 18Kb (2x 9Kb) Block RAM, the second generation DSP48A1 Slice, SDRAM Memory Controller, enhancement mode mixed mode Clock management module, SelectIO
tMthe high speed serialization transceiver module of technology, power optimization, PCI
compatible endpoint module, AS level power supply management mode, automatically detect config option, and by enhanced ip security that AES and Device DNA defencive function realizes.These excellent specific properties provide the replacement scheme able to programme of low cost for customizing ASIC product with unprecedented ease for use.Spartan-6 FPGA can be logical design in enormous quantities, is that the DSP design of guiding and cost-sensitive Embedded Application provide best solution with consumer.Spartan-6 FPGA has established solid programmable chip basis, is highly suitable for the target design platform that can provide integrated software and hardware assembly, energy can be focused on innovation work to make designer at the beginning of development starts.
1. the grading of Spartan-6 fpga logic unit has fully demonstrated the more powerful logical block ability that up-to-date 6 input LUT frameworks possess.
2. each Spartan-6 FPGA Slice all comprises 4 LUT and 8 triggers.
3. each DSP48A1 Slice includes a 18x18 multiplier, a totalizer and a totalizer.
4. Block RAM size is 18Kb substantially.Each module can also as two independently 9Kb module uses.
5. each CMT includes two DCM and PLL.
6. under-3N speed step, do not support Memory Controller module.
Technician can select the concrete model being applicable to project according to the needs relating to input.
MBI5024 chip has following features:
MBI5024 utilizes up-to-date PrecisionDrive
tMtechnology, aim at the drive IC of LED display panel design, the CMOS bit shift register that it is built-in and bolt-lock function, can convert the input data of serial to parallel output data formats.
The input voltage range value of MBI5024 is 3.3 volts to 5 volts, provides 16 current sources, 3-45mA can be provided to determine the magnitude of current with driving LED in each output stage; And in single IC the current difference of output channel be less than ± 3%; Output current difference between many IC is less than ± and 6%; Electric current, along with output terminal withstand voltage (VDS) change, is controlled in every volt 0.1%; And electric current is subject to service voltage (VDD), the change of environment temperature is also controlled in 1%.User can via selecting the RSET of different resistance to adjust the size of current of each output stage of MBI5024, by this mechanism, and user can the luminosity of accurately control LED.
The design of MBI5024 ensures that its output stage can be withstand voltage 17 volts, therefore can be connected in series multiple LED at each output terminal.
In addition, MBI5024 also provides the high clock frequency of 25MHz to meet system to the demand in mass data transmission.
Control element in LED display adopts MBI5024 control chip, MBI5024 chip is that a performance that accumulation science and technology in Taiwan controls to release for LED display is specially high, the chip that cost is low, LED display for the type controls to realize its display demand, reduces the cost of whole screen simultaneously.
This chip main lift display screen uniformity coefficient of MBI5024, and tolerate that larger LED luminance difference is to reduce manufacturing cost, simultaneously because current accuracy improves, larger LED luminance error can be tolerated, contribute to manufacturer and reduce LED purchase cost.
Claims (8)
1. a LED display driving circuit, comprise LED and driving chip, three driving chip and three groups of LED form a display unit, each driving chip drives one group of LED, three groups of LED are respectively one group of red LED lamp, one group of green LED lamp, one group of blue led lamp, each signal output pin of driving chip is respectively connected with a LED group of connecting, it is characterized in that: the red LED lamp of each group series connection and a resistance of all connecting between power supply, the power input port of each display unit connects rc filter circuit.
2. LED display driving circuit according to claim 1, it is characterized in that: described driving chip comprises 8 or 16 drive singal output pins, control signal input pin, control signal output pin, sheets select input pin, latch signal pin, a clock signal pin, wherein, the control signal input pin of three driving chip, output pin are sequentially connected in series.
3. LED display driving circuit according to claim 1, is characterized in that: described LED is paster LED lamp or plug-in unit LED.
4. LED display driving circuit according to claim 1, is characterized in that: the resistance of described resistance is 50 Europe, Europe ~ 100.
5. based on the LED display of LED display driving circuit described in claim 1, it is characterized in that: comprise screen body, controller, host computer, wherein, screen body comprises several casings, and each casing comprises multiple module, and each module comprises organizes display unit more, by connecting and/or being connected in parallel between display unit, by host computer, video information is sent to controller, controller, to after video information encoding and decoding, is sent to screen body and shows.
6. LED display according to claim 5, is characterized in that: the central processing unit of described controller adopts fpga chip.
7. LED display according to claim 6, is characterized in that: the central processing unit of described controller adopts the one in the Spartan-6 family chip of Xilinx company.
8. LED display according to claim 5, is characterized in that: described driving chip is MBI5024 or MBI5167 that scientific & technical corporation is built up in Taiwan.
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| CN201510373182.1A CN104978928A (en) | 2015-06-30 | 2015-06-30 | LED display screen and driving circuit thereof |
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| CN201510373182.1A CN104978928A (en) | 2015-06-30 | 2015-06-30 | LED display screen and driving circuit thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110930941A (en) * | 2019-11-11 | 2020-03-27 | 武汉天马微电子有限公司 | Display module and display device |
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| CN202126823U (en) * | 2011-07-06 | 2012-01-25 | 黄水桥 | Novel LED (light emitting diode) energy saving screen |
| CN102568372A (en) * | 2010-12-16 | 2012-07-11 | 陕西亚泰电器科技有限公司 | Novel light emitting diode (LED) display device |
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| CN203338719U (en) * | 2013-06-21 | 2013-12-11 | 深圳市奥拓电子股份有限公司 | LED display screen and LED display module thereof |
| CN104347032A (en) * | 2014-11-20 | 2015-02-11 | 无锡科思电子科技有限公司 | Driving circuit of outdoor LED (Light Emitting Diode) display screen |
| CN104347033A (en) * | 2014-11-20 | 2015-02-11 | 无锡科思电子科技有限公司 | LED (Light-Emitting Diode) display screen driving circuit |
| CN104347034A (en) * | 2014-11-20 | 2015-02-11 | 无锡科思电子科技有限公司 | Double-power LED (light-emitting diode) display screen drive circuit |
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2015
- 2015-06-30 CN CN201510373182.1A patent/CN104978928A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202049714U (en) * | 2010-12-01 | 2011-11-23 | 国琏电子（上海）有限公司 | Light-emitting diode (LED) driving system |
| CN102568372A (en) * | 2010-12-16 | 2012-07-11 | 陕西亚泰电器科技有限公司 | Novel light emitting diode (LED) display device |
| CN202126823U (en) * | 2011-07-06 | 2012-01-25 | 黄水桥 | Novel LED (light emitting diode) energy saving screen |
| CN102810295A (en) * | 2012-08-10 | 2012-12-05 | 深圳市易事达电子有限公司 | Intelligent led display screen |
| CN203338719U (en) * | 2013-06-21 | 2013-12-11 | 深圳市奥拓电子股份有限公司 | LED display screen and LED display module thereof |
| CN104347032A (en) * | 2014-11-20 | 2015-02-11 | 无锡科思电子科技有限公司 | Driving circuit of outdoor LED (Light Emitting Diode) display screen |
| CN104347033A (en) * | 2014-11-20 | 2015-02-11 | 无锡科思电子科技有限公司 | LED (Light-Emitting Diode) display screen driving circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110930941A (en) * | 2019-11-11 | 2020-03-27 | 武汉天马微电子有限公司 | Display module and display device |
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Application publication date: 20151014 |
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