CN203085132U - Drive circuit of LED display screen - Google Patents
Drive circuit of LED display screen Download PDFInfo
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- CN203085132U CN203085132U CN2012205058753U CN201220505875U CN203085132U CN 203085132 U CN203085132 U CN 203085132U CN 2012205058753 U CN2012205058753 U CN 2012205058753U CN 201220505875 U CN201220505875 U CN 201220505875U CN 203085132 U CN203085132 U CN 203085132U
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Abstract
A drive circuit of an LED display screen solves the problems in the prior art that the work is not stable and reliable, the power consumption is large, the anti-interference capability is weak and the interface circuits are few, and comprises a power supply control unit circuit, interface circuits, a control unit circuit, a signal decoding unit circuit, a starting circuit, a sequential control unit circuit and an external memorizer. The power supply control unit circuit supplies power to the parts of a drive system, the control unit circuit is connected with the signal decoding unit circuit, the starting circuit and the external memorizer via buses, and the interface circuits are connected with the control unit circuit; the signal decoding unit circuit receives an external AV signal input, the starting circuit can receive an external computer VGA signal input and an output coming from the signal decoding unit circuit, and the output of the starting circuit drives the LED display screen via the sequential control unit circuit. By employing the drive circuit of the LED display screen, the beneficial effects are achieved that the work is stable and reliable, the power consumption is small, the anti-interference capability is strong and the interface circuits are many.
Description
Technical field
The utility model belongs to a kind of LED display driving circuit.
Background technology
The LED display driving circuit also has a lot of manufacturers to provide, but owing to electromagnetic environment abominable in the automobilism and limited installing space, most display screen display effects are poor, a little less than the antijamming capability, power consumption is big, and interface circuit is limited, generally have only panel button and serial ports, be unfavorable for control operation, have the problem that job insecurity is reliable, power consumption is big, antijamming capability is weak, interface circuit is few, enjoy the facility that navigational system brings to the full to the user and brought trouble navigational system.
Summary of the invention
The purpose of this utility model is: a kind of LED display driving circuit is provided, have to solve prior art that job insecurity is reliable, power consumption is big, a little less than the antijamming capability, problem that interface circuit is few.
The technical scheme that the utility model adopted is: a kind of LED display driving circuit, comprise the power control unit circuit, interface circuit, control unit circuit, the signal decoding unit circuit, start-up circuit, the timing control unit circuit, external memory storage, the power control unit circuit provides power supply for the drive system each several part, control unit circuit is by bus and signal decoding unit circuit, start-up circuit, external memory storage connects, interface circuit is connected with control unit circuit, the signal decoding unit circuit receives the input of external AV vision signal, start-up circuit can receive outer computer VGA signal input and from the output of signal decoding unit circuit, the output of start-up circuit is through timing control unit drives LED display.
Comprise main power circuit and grid bias power supply circuit in the described power control unit circuit, main power circuit adopts DC-DC switching power source chip PQ1CZ1, chip the 4th pin is the entire circuit feedback end, output voltage is connect chip the 4th pin after backfeed loop resistance R 11, R12 dividing potential drop, the output of chip the 2nd pin is through schottky diode V11, inductance L 11 and capacitor C 13 rectifications, energy storage and release energy, reduce ripple, obtains stable output voltage.
The grid bias power supply circuit adopts voltage boosting dc/d-c transformer S-8356M50MC, input VDD connects chip 2 pin and imports as chip internal voltage comparator anode, output voltage is through resistance R 21, R22, the feedback network dividing potential drop that capacitor C 21 is formed connects chip 1 pin and imports as chip internal comparer negative terminal, in the external transistor FDS6612A output of chip the 5th pin, inductance L 21 is connected in 5 of VDD and transistor FDS6612A, 6,7, between 8 pin, the high low pulse signal of inductance right-hand member output forward, through forward commutation diode V21 and capacitor C 23 rectifications is stable positive voltage, simultaneously, pulse signal is through capacitor C 25, diode V22 upset is negative-going pulse, and is negative voltage through negative sense commutation diode V23 and capacitor C 24 rectifications.
Control unit circuit adopts can repeat 51 erasable series monolithics.
Interface circuit adopts one of touch-screen, infrared remote control, panel button, four kinds of modes of serial ports input.
The good effect that the utility model had is: adopt the utility model to reach the effect of having a mind to that working stability is reliable, power consumption is little, antijamming capability is strong, interface circuit is many.
Description of drawings
Fig. 1 is a functional-block diagram of the present utility model.
Fig. 2 is main power circuit figure in the utility model.
Fig. 3 is a grid bias power supply circuit diagram in the utility model.
Embodiment
Below in conjunction with accompanying drawing the utility model is further described
As shown in Figure 1, a kind of LED display driving circuit comprises power control unit circuit, interface circuit, control unit circuit, signal decoding unit circuit, start-up circuit, timing control unit circuit, external memory storage.The various voltages that the power control unit circuit provides drive system to need.Control unit circuit is connected with signal decoding unit circuit, start-up circuit, external memory storage by bus, interface circuit is connected with control unit circuit, the signal decoding unit circuit receives the input of external AV vision signal, start-up circuit can receive outer computer VGA signal input and from the output of signal decoding unit circuit, the output of start-up circuit is through timing control unit drives LED display.
The passage that signal decoding unit circuit, start-up circuit, timing control unit circuit mainly provide input signal to show, each element circuit relative fixed.The signal decoding unit circuit is input as analog video signal, is output as 8Bit numeral YUV signal; Start-up circuit is input as simulation VGA signal or digital YUV signal, is output as three groups of digital rgb signals, and timing control signal; The timing control unit circuit is input as digital rgb signal and timing control signal, is output as 6.5 cun screens and shows various clock signals and the digital rgb signal that needs.This several sections is finished the basic function of display driving system.
The various voltages that the power control unit circuit provides drive system to need comprise the main power circuit that produces main operating voltage and produce the grid bias power supply circuit that shows bias voltage that the quality of design is directly connected to screen display effect and system cost.
In the power circuit, be input as 12 volts of (V) power supply power supplies (the automobile power source normal voltage is 12V).The SHARP of Sharp digital LED display screen operate as normal need following voltage :+5V and+3.3V operating voltage (while also is the operating voltage of each main chip); + 15V ,-17.4VLED display screen liquid crystal molecule circuit bias voltage, and positive and negative 6.5V liquid crystal molecule circuit common voltage.A little less than most of on the market at present display screen antijamming capabilities, very big reason is that the power circuit design is not too reasonable, and various frequencies interact in the display driver plate.In this drive plate, selecting the PQ1CZ1 of SHARP company of Sharp and the S-8356M50MC of Seiko company for use, all is switching power source chips, greatly reduces power consumption.
Main power circuit as shown in Figure 2, DC-DC switching power source chip PQ1CZ1 (D11 among Fig. 2) provide display driver plate master operating voltage 5V and 3.3V, PQ1CZ1 is input as 12V voltage, the output reference voltage terminal is 1.26V, connect two divider resistances by reference voltage terminal, can obtain+5V or+3.3V voltage.During operate as normal, PQ1CZ1 works in PWM mode (PWM), compare by inner 1.26V reference voltage source and chip the 4th pin feedback end, obtain the switching pulse control signal, and there is inner amplifying circuit to amplify this signal, the outside big electric current of energy drive, chip the 4th pin is the entire circuit feedback end, with output voltage through backfeed loop resistance R 11, connect chip the 4th pin after the R12 dividing potential drop, and by chip internal pulse width control circuit auto-control, make the stable 1.26V that remains of chip the 4th pin voltage, to produce the switch pulse-width control signal behind the inner pulse width control circuit auto-control, after amplify inside, export by chip the 2nd pin, and by schottky diode V11, inductance L 11 and capacitor C 13 are finished rectification, realize energy storage and release energy, reduce ripple, obtain stable output voltage, output voltage occurrence computing formula is Vout=1.26 (1+R11/R12), select different R11 and R12 resistance, can obtain required voltage value 5V and 3.3V.Chip PQ1CZ1 output power is up to 8 watts (W); switching frequency is 100K hertz (Hz), disturbs almost not influence of sensitive frequency to showing line frequency (31.5KHz) or shift clock frequency (33MHz) etc., in addition; embedded overheated and overcurrent protection, very reliable and stable.
The grid bias power supply circuit as shown in Figure 3, bias circuit provide bias voltage+15V that LED display needs ,-17.4V, and LED display common port needs+6.5V ,-6.5V voltage, this part is the difficult point in this drive plate power circuit, the negative pressure that bias voltage requires is too high, and electric current is too small.Fig. 3 is the LCD application circuit that produces positive voltage and negative voltage (this circuit produces positive and negative 6.5V voltage, produce positive 15V and negative 17.4V potential circuit is similar).Core devices is voltage boosting dc/d-c transformer (S-8356M50MC in the circuit, see D21 among Fig. 3), this chip is input (VDD)/output (VOUT) divergence type device, VDD is as chip D21 builtin voltage comparer anode reference voltage in input, resistance R 21, R22, the feedback network that capacitor C 21 is formed is imported as the voltage comparator negative terminal, similar aforementioned switches power supply chip PQ1CZ1 is used for producing the switch pulse-width control signal equally.Input VDD connects chip 2 pin, and the feedback network dividing potential drop that output voltage is formed through resistance R 21, R22, capacitor C 21 connects chip 1 pin (chip VOUT end), exports at chip the 5th pin.In order to save chip volume, this chip internal does not have amplifying circuit, so this signal is very faint control signal, needs external transistor (FDS6612A sees D22 among Fig. 3) to strengthen current driving ability.Inductance L 21 is connected between 5,6,7,8 pin of VDD and transistor FDS6612A, model is MTRW5D28-101M, inductance L 21 is to finish energy storage at 1 o'clock at pulse signal, being to release energy in 0 o'clock, at the high low pulse signal of inductance right-hand member output forward, is stable positive voltage through forward commutation diode V21 and capacitor C 23 rectifications, simultaneously, pulse signal is through capacitor C 25, and diode V22 upset is negative-going pulse, and is negative level through negative sense commutation diode V23 and capacitor C 24 rectifications.During operate as normal, at the positive 5V level of chip VOUT end (also being feedback end simultaneously) fixing output, the ratio of adjusting resistance R 21 and R22 can obtain user's required voltage (being positive and negative 6.5V among Fig. 3).In this circuit, positive voltage directly is reversed to negative voltage, so positive voltage and negative voltage can not produce unbalance voltage.When needing unbalance voltage, can make mu balanced circuit by transistor etc. at output terminal and come burning voltage.In addition, S-8356M50MC switching frequency 300KHz, away from sensitive frequency such as row field frequencies range and shift clock in this drive plate, and also the high frequencyization of device, can use less inductance, realize the miniaturization of product.External FDS6612A manages as NMOS, compares with bipolar transistor, and switching rate is very fast, so switching loss can be smaller, efficient can be higher.Produce generating positive and negative voltage by a core assembly sheet, saved circuit cost, also saved board area simultaneously.
The single-chip microprocessor MCU element circuit is native system control and treatment center, adopt the SM89516A of SYNCMOS company, this chip is common ARM series monolithic, inner integrated 64K flash memory FLASH, 1K random access memory ram, can repeat erasable, software maintenance is convenient, two external interrupt ports is arranged, two timers, a serial ports, 28 I/O mouths.
The interface circuit operating system of user by being connected with single-chip microcomputer, interface circuit comprises touch-screen, infrared remote control, four kinds of different modes of panel button and serial ports, the various processing of interface circuit are finished in 51 erasable system's single-chip microcomputers, the user is very flexible to the operation of system, program updates and easy to maintenance quick.
Infrared remote-controlled signal sends from Infrared remote controller, received by infrared receiving chip HS0038B, when single is pressed remote controller key, startup sign indicating number and 32 bit data sign indicating numbers that HS0038B output is 108 milliseconds, if press remote controller key continuously, HS0038B then sends 11.5 milliseconds running fire sign indicating number, the output of HS0038B connects the external interrupt 1 of single machine unit circuit, receive infrared signal in real time, when single-chip microcomputer has detected infrared signal, timer 1 is with regard to opening entry infrared signal pulse width in the single-chip microcomputer, the positive negative pulse stuffing that defines 1.125 milliseconds is that the positive negative pulse stuffing of 0,2.25 millisecond of data is data 1, explains the key value of corresponding remote controller key, according to different code values, enter corresponding processing program.
Touch-screen adopts four-wire resistance type, and it mainly is to obtain correct X, the Y position that touch-screen is handled, four-wire type resistance screen has X+, X-, Y+, four output ports of Y-, when touching, give X+, this adds fixedly voltage to electrode X-, electric field can evenly distribute at the touch-screen conductive layer, the voltage at place, contact can reflect on Y+ (or Y-), by metering contact place voltage over the ground, just can obtain the Y coordinate figure of touch point; The measured X coordinate time is similar, changes at Y+, and the Y-making alive is surveyed X+ (or X-) voltage and got final product.Four port simulating signals are directly delivered to A/D chip ADS7846 and are detected, ADS7846 has four road analog input channels and unique low line resistance switch, it allows to provide power supply and ground by unchecked input channel for outside line, set by such structure and reference voltage, can greatly eliminate the error that internal switch resistance brings, this error is this class converter main error sources, and by single-chip microcomputer ADS7846 is set and adopts the difference working method, make its transformation result total and non-essential resistance is proportional, eliminate the influence of internal switch fully, 12 X coordinates after the ADS7846 conversion and Y coordinate, carry out fault-tolerant processing after delivering to MCU again, eight samplings of fault-tolerant employing are averaged, and abandon erroneous point, make the touch-screen location very accurate, the user is accurate to the operation of picture.
The panel button circuit structure adopts 4 * 4 array way, detect by 8 I/O mouths of single-chip microcomputer, be divided into 4 word lines, 4 bit lines, circulation is provided with word line for fixing (0 or 1) level during work, inquires about bit-line levels, if identical with word line, then thinking has button to press, and distinguishes different buttons according to different word lines with bit line.
Aforementioned three kinds of interface circuits all are that the people is direct and display driving system is mutual, in addition, also can finish the communication of display driving system and external system (as the guidance entertainment system host computer system) by serial ports, finish more senior setting or processing.Because single-chip microcomputer and standard computer serial ports level are inconsistent, native system adopts level transferring chip SPX202EEN to convert Transistor-Transistor Logic level to computer standard serial ports level, Transmission bit rate is controlled by the single-chip microcomputer timer 2, can freely be provided with, be commonly defined as 9600 bits, transformat adopts information header, message length, Information sign, the information content and inspection of information school and combination, form can freely define by customer requirements.
Claims (3)
1. LED display driving circuit, comprise the power control unit circuit, interface circuit, control unit circuit, the signal decoding unit circuit, start-up circuit, the timing control unit circuit, external memory storage, it is characterized in that: the power control unit circuit provides power supply for each several part, control unit circuit is by bus and signal decoding unit circuit, start-up circuit, external memory storage connects, interface circuit is connected with control unit circuit, the signal decoding unit circuit receives the input of external AV vision signal, start-up circuit can receive outer computer VGA signal input and from the output of signal decoding unit circuit, the output of start-up circuit is through timing control unit drives LED display.
2. a kind of LED display driving circuit as claimed in claim 1, it is characterized in that: comprise main power circuit and grid bias power supply circuit in the power control unit circuit, main power circuit adopts DC-DC switching power source chip PQ1CZ1, chip the 4th pin is the entire circuit feedback end, with output voltage through backfeed loop resistance R 11, connect chip the 4th pin after the R12 dividing potential drop, the output of chip the 2nd pin is through schottky diode V11, inductance L 11 and capacitor C 13 rectifications, energy storage and releasing energy, reduce ripple, obtain stable output voltage, the grid bias power supply circuit adopts voltage boosting dc/d-c transformer S-8356M50MC, input VDD connects chip 2 pin and imports as chip internal voltage comparator anode, output voltage is through resistance R 21, R22, the feedback network dividing potential drop that capacitor C 21 is formed connects chip 1 pin and imports as chip internal comparer negative terminal, in the external transistor FDS6612A output of chip the 5th pin, inductance L 21 is connected in 5 of VDD and transistor FDS6612A, 6,7, between 8 pin, the high low pulse signal of inductance right-hand member output forward, through forward commutation diode V21 and capacitor C 23 rectifications is stable positive voltage, simultaneously, pulse signal is through capacitor C 25, diode V22 upset is negative-going pulse, and is negative voltage through negative sense commutation diode V23 and capacitor C 24 rectifications.
3. a kind of LED display driving circuit as claimed in claim 1 or 2 is characterized in that: control unit circuit adopts can repeat erasable ARM series monolithic.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012205058753U CN203085132U (en) | 2012-09-29 | 2012-09-29 | Drive circuit of LED display screen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012205058753U CN203085132U (en) | 2012-09-29 | 2012-09-29 | Drive circuit of LED display screen |
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| Publication Number | Publication Date |
|---|---|
| CN203085132U true CN203085132U (en) | 2013-07-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012205058753U Expired - Fee Related CN203085132U (en) | 2012-09-29 | 2012-09-29 | Drive circuit of LED display screen |
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| CN (1) | CN203085132U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103531147A (en) * | 2013-10-25 | 2014-01-22 | 无锡中星微电子有限公司 | LED driving circuit and LED driving system employing driving circuit |
| CN113163538A (en) * | 2020-01-22 | 2021-07-23 | 海信视像科技股份有限公司 | Display device |
-
2012
- 2012-09-29 CN CN2012205058753U patent/CN203085132U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103531147A (en) * | 2013-10-25 | 2014-01-22 | 无锡中星微电子有限公司 | LED driving circuit and LED driving system employing driving circuit |
| CN103531147B (en) * | 2013-10-25 | 2016-04-20 | 无锡中感微电子股份有限公司 | LED drive circuit and use the LED drive system of this driving circuit |
| CN113163538A (en) * | 2020-01-22 | 2021-07-23 | 海信视像科技股份有限公司 | Display device |
| CN113163538B (en) * | 2020-01-22 | 2022-12-23 | 海信视像科技股份有限公司 | Display device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20130724 Termination date: 20150929 |
|
| EXPY | Termination of patent right or utility model |