CN1909032A - LED display screen control system - Google Patents
LED display screen control system Download PDFInfo
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- CN1909032A CN1909032A CNA2006100530164A CN200610053016A CN1909032A CN 1909032 A CN1909032 A CN 1909032A CN A2006100530164 A CNA2006100530164 A CN A2006100530164A CN 200610053016 A CN200610053016 A CN 200610053016A CN 1909032 A CN1909032 A CN 1909032A
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Abstract
The related LED control system comprises: an upper computer to send data to a master-control SCM connected with an external data memory by bus, an I/O interface, a general display interface, a LED drive circuit to receive data from SCM, a USB bus, a USB interface chip, and a general asynchronous receiver-transmitter to connect the SCM and LED interface together with I/O interface. This invention has fast transmission speed, low cost and fit to wide application.
Description
Technical field
The present invention relates to a kind of display screen control system, relate in particular to a kind of LED display control system based on usb communication.
Background technology
Along with the development of society, LED display has all obtained using widely in many occasions, and particularly advertising sector uses especially extensive.Existing LED display control system is to need content displayed to issue main control singlechip with the form of character code by the RS232 serial ports host computer, after treatment, finally shows on LED display.As shown in Figure 1 and Figure 2, its principle is as follows: host computer is passed to main control singlechip by the RS232 serial communication with character code A, and main control singlechip is stored in character code in the external data memory by data bus again.The power lead of external data memory is connected with the power down protection module, has the power-failure memory function to guarantee display screen.The data bus of main control singlechip connects outside type matrix storer (being used for storing the program storage of character library) simultaneously again, and is that index finds in the type matrix storer and the character pattern data B that reads corresponding character code A correspondence returns to main control singlechip with character code A.Character pattern data comprises column signal and row signal, and the transmission of each signal has certain sequential; Wherein, column signal need carry out serial transmission, and the row signal then is a parallel transmission.The RS232 serial ports is used for communicating by letter with host computer, so its column signal can not send by the RS232 serial ports again.If I/O mouth output serial signal needs regularly interruption, use regularly interrupts both having wasted resource and transmission speed is also very slow, also causes the conflict between each interruption easily, so present I/O mouth is only done parallel transmission.The method that is used for finishing above-mentioned clock signal generation at present and sends mainly contains two kinds: 1, use programmable logic device (PLD) (CPLD), by programming, the parallel column signal transitions that CPLD will receive from main control singlechip I/O mouth is a serial signal, and that the row signal is kept parallel state is constant, with certain time sequence column signal and row signal is passed to the driving circuit of LED display again by the general-purpose interface of LED display; 2, use also-string conversion shift register, the parallel column signal transitions that will receive from main control singlechip I/O mouth is a serial signal, pass to the driving circuit of LED display again by the general-purpose interface of LED display, and the row signal is directly passed through the general-purpose interface transmission of LED display by the I/O mouth of single-chip microcomputer, and the sequential of the transmission of column signal and row signal is all controlled by main control singlechip.The driving circuit of LED display can show that host computer requires content displayed after receiving above-mentioned column signal and row signal.
There is following defective in above-mentioned existing LED display control system: 1, traditional RS232 serial ports can only be issued main control singlechip with character code A, single-chip microcomputer again from the type matrix storer addressing read character pattern data, not only transmission speed is slow, and is difficult to carry out the magnanimity transmission of character pattern data; 2, the type matrix storer of curing must be arranged in total system, if deposit the character pattern data of multi-language character or multiple font, the expense of type matrix storer will be very big also; The serial port of single-chip microcomputer is used for carrying out RS 232 communication in addition, and system also must produce the standard control signal of display screen by CPLD or shift register, not only increased the complexity of system greatly, and because parts are too much, the total system cost is very high; 3, the RS232 interface may burn out when hot plug, and when serious even cause the mainboard and the system failure, hardware security is relatively poor; 4, on the present market, consider the hardware security problem, some notebook computers have been abandoned the compatibility to the RS232 serial ports, this moment is if will control the display screen of RS232 interface with it, then must use the USB-RS232 patchcord, and the price of patchcord at present is usually in dozens of yuan even unit up to a hundred, the cost height, and versatility is poor.
Summary of the invention
In order to solve above-mentioned technological deficiency, the object of the invention provides that a kind of transmission speed is fast, production cost is low, security performance is good, the LED display control system of highly versatile.
In order to reach the foregoing invention purpose, the present invention has adopted following technical scheme: a kind of LED display control system comprises host computer, main control singlechip, external data memory, I/O mouth, LED display general-purpose interface and LED display driving circuit.Described LED display control system also comprises usb bus, USB interface chip and UART Universal Asynchronous Receiver Transmitter; Host computer is passed to main control singlechip by usb bus with character pattern data; Main control singlechip connects external data memory by data bus; Main control singlechip links to each other with the general-purpose interface of LED display with the I/O mouth by the asynchronism transceiver interface, and main control singlechip is passed to character pattern data the LED display driving circuit that links to each other with the LED display general-purpose interface.
As preferably, described USB interface chip has reception and sends two-way buffer zone, host computer is passed to the USB interface chip by usb bus with character pattern data, and be temporary in the send buffer of USB interface chip, main control singlechip is read the character pattern data that host computer sends from the send buffer of USB interface chip.
As preferably, described USB interface chip can be finished by the conversion of usb protocol coded data to general data.
As preferably, described USB interface chip connects main control singlechip by data bus.
As preferably, described external data memory is used to preserve parameters such as the animation mode of the LED display that character pattern data and user be provided with and translational speed, is connected with the power down protection module on the power lead of external data memory.
As preferably, described character pattern data comprises column signal and row signal, and the main control singlechip UART Universal Asynchronous Receiver Transmitter sends column signal, and the I/O mouth sends the row signal, and all the sequential of signals is finished by main control singlechip control.
As preferably, described host computer is PC or USB flash disk with automatic loading character pattern data function.
The present invention is owing to adopted technique scheme, have following advantage: 1, transmission speed is fast: replaced original RS232 interface with usb bus and USB interface chip, the top speed of USB2.0 is 480Mb/s, and the high transmission speed of RS232 serial ports is 0.115Mb/s, the transmission speed that is to say USB is more than 4000 times of RS232 serial ports, is more suitable for the transmission of large-scale data such as character pattern data and image data; High speed makes control system more succinct flexibly simultaneously; The high speed magnanimity transmission feature system that makes of USB can directly pass to main control singlechip with character pattern data, just can change font type flexibly by the PC host computer procedure; 2, production cost is low: need not to solidify character pattern data, reduced system overhead.Use asynchronism transceiver interface and I/O to realize the signal transmission, traditional programmable logic device (CPLD) or shift register have been replaced, in control system based on USB, single-chip microcomputer can utilize its serial port directly to produce the standard control signal, system is more simplified, therefore, the LED display control system based on USB interface communication has clear superiority on production cost; 3, hardware security is good: USB interface has " hot plug " (hot attach ﹠amp; Detach) and the characteristic of plug and play (plug-and-play), not easy burn-out; 4, versatility is good: USB is the new interface technology that is applied in the PC field in recent years, it is a kind of USB (universal serial bus) communication standard that the large manufacturer of some computing machines and electronics technology formulates in order to solve day by day the computer peripheral equipment that increases and limited host slot and the contradiction between the port, being supported by each computing machine and operating system producer widely, is the main flow interface of computing machine and peripheral communication now; The versatility of USB interface and abundant peripheral hardware resource also provide more fast way for display screen control, as in USB flash disk, writing control program, USB flash disk is inserted USB interface, by the Auto Loader of working out in advance, just can easily character pattern data be sent into display screen, be suitable for the off-line control of LED display.This LED display control system also has advantage simple in structure, easy to use, can be widely used in the LED display manufacturing.
Description of drawings
Fig. 1: traditional LED display control system is used the theory diagram of programmable logic device (CPLD) in the background technology.
Fig. 2: traditional LED display control system is used the theory diagram of shift register in the background technology.
Fig. 3: the theory diagram of the embodiment of the invention.
Fig. 4: the control program theory diagram in the embodiment of the invention in the host computer.
Embodiment
Below in conjunction with Fig. 3, Fig. 4 the specific embodiment of the present invention is made a detailed explanation.
As shown in Figure 3, a kind of LED display control system comprises that host computer, main control singlechip, external data memory, usb bus, USB interface chip, UART Universal Asynchronous Receiver Transmitter, I/O mouth, LED display general-purpose interface and LED display driving circuit constitute.The USB interface chip has reception and sends two-way buffer zone, and the USB interface chip can also be finished by the conversion of usb protocol coded data to general data.
Host computer is connected with the USB interface chip by usb bus, and character pattern data B is passed to the USB interface chip, and is temporary in the send buffer of USB interface chip.Main control singlechip is connected by data bus with the USB interface chip, reads the character pattern data that host computer sends from the send buffer of USB interface chip.The data bus of main control singlechip connects external data memory simultaneously again, and parameters such as the animation mode of the LED display that character pattern data and user are provided with and translational speed are kept in the external data memory.The power lead of external data memory is connected with the power down protection module, has the power-failure memory function to guarantee display screen.Character pattern data comprises column signal and row signal, and the transmission of each signal has certain sequential; Wherein, column signal need carry out serial transmission, and the row signal then is a parallel transmission.For reduce cost, simplified system, this system directly adopts the RS232 interface of main control singlechip, its UART Universal Asynchronous Receiver Transmitter UART just sends column signal.The row signal is sent by the I/O mouth of main control singlechip, and all the sequential of signal is finished by main control singlechip control.So only the UART interface and the I/O mouth of main control singlechip need be linked to each other with the general-purpose interface of LED display, just shows signal can be passed to the driving circuit of LED display.The LED display driving circuit can show host computer requirement content displayed after receiving above-mentioned column signal and row signal.
Above-mentioned LED display control system can be according to the control program in the different demonstration needs adjustment host computers, control program principle such as Fig. 4 in the host computer comprise the setting (line number that comprises display screen of LED display basic parameter, the number of display elements of every row etc.), the importing of text and picture (comprising the input of various spoken and written languages), the selection of font, the generation of type matrix and image data (can generate the type matrix and the image data of various directions and mirror image), append or delete empty curtain, the setting of LED display animation mode and translational speed, show preview, step block such as transmission are formed.
Above-mentioned host computer can be that PC also can be a USB flash disk.The versatility of USB interface and abundant peripheral hardware resource also provide more fast way for display screen control.When host computer adopts USB flash disk, in USB flash disk, write control program earlier, USB flash disk is inserted USB interface,, just can easily character pattern data be sent into display screen, be suitable for the off-line control of LED display by the Auto Loader of working out in advance.
Claims (7)
1, a kind of LED display control system, comprise host computer, main control singlechip, external data memory, I/O mouth, LED display general-purpose interface and LED display driving circuit, it is characterized in that described LED display control system also comprises usb bus, USB interface chip and UART Universal Asynchronous Receiver Transmitter; Host computer is passed to main control singlechip by usb bus with character pattern data; Main control singlechip connects external data memory by data bus; Main control singlechip links to each other with the general-purpose interface of LED display with the I/O mouth by the asynchronism transceiver interface, and main control singlechip is passed to character pattern data the LED display driving circuit that links to each other with the LED display general-purpose interface.
2, a kind of LED display control system according to claim 1, it is characterized in that described USB interface chip has reception and sends two-way buffer zone, host computer is passed to the USB interface chip by usb bus with character pattern data, and be temporary in the send buffer of USB interface chip, main control singlechip is read the character pattern data that host computer sends from the send buffer of USB interface chip.
3, a kind of LED display control system according to claim 1 is characterized in that described USB interface chip can finish by the conversion of usb protocol coded data to general data.
4, according to claim 1 or 2 or 3 described a kind of LED display control system, it is characterized in that described USB interface chip connects main control singlechip by data bus.
5, according to claim 1 or 2 or 3 described a kind of LED display control system; it is characterized in that described external data memory is used to preserve parameters such as the animation mode of the LED display that character pattern data and user be provided with and translational speed, is connected with the power down protection module on the power lead of external data memory.
6, a kind of LED display control system according to claim 5, it is characterized in that described character pattern data comprises column signal and row signal, the main control singlechip UART Universal Asynchronous Receiver Transmitter sends column signal, and the I/O mouth sends the row signal, and all the sequential of signal is finished by main control singlechip control.
7, a kind of LED display control system according to claim 6 is characterized in that described host computer is PC or USB flash disk with automatic loading character pattern data function.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006100530164A CN1909032A (en) | 2006-08-18 | 2006-08-18 | LED display screen control system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006100530164A CN1909032A (en) | 2006-08-18 | 2006-08-18 | LED display screen control system |
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| CN1909032A true CN1909032A (en) | 2007-02-07 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101312013B (en) * | 2007-05-22 | 2010-10-06 | 比亚迪股份有限公司 | LCD module group demonstration system |
| CN101923830A (en) * | 2010-07-06 | 2010-12-22 | 湖南新亚胜科技发展有限公司 | Asynchronous control system for light emitting diode (LED) display screen |
| CN102542994A (en) * | 2012-03-14 | 2012-07-04 | 无锡聚润光电电器有限公司 | Method and device for displaying running information on buses |
| CN103258518A (en) * | 2012-02-15 | 2013-08-21 | 上海智显光电科技有限公司 | Display control system with configuration updated by the adoption of mobile storage device |
| CN103258519A (en) * | 2012-02-15 | 2013-08-21 | 上海智显光电科技有限公司 | Display control system with changeable display configurations |
| CN103971641A (en) * | 2014-05-20 | 2014-08-06 | 利亚德光电股份有限公司 | Led display screen control system |
| CN107799056A (en) * | 2017-12-13 | 2018-03-13 | 太仓鼎诚电子科技有限公司 | A kind of LED display control system based on FPGA |
| CN108181887A (en) * | 2018-02-12 | 2018-06-19 | 深圳汇通九州科技有限公司 | A kind of huge curtain controller |
-
2006
- 2006-08-18 CN CNA2006100530164A patent/CN1909032A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101312013B (en) * | 2007-05-22 | 2010-10-06 | 比亚迪股份有限公司 | LCD module group demonstration system |
| CN101923830A (en) * | 2010-07-06 | 2010-12-22 | 湖南新亚胜科技发展有限公司 | Asynchronous control system for light emitting diode (LED) display screen |
| CN103258518A (en) * | 2012-02-15 | 2013-08-21 | 上海智显光电科技有限公司 | Display control system with configuration updated by the adoption of mobile storage device |
| CN103258519A (en) * | 2012-02-15 | 2013-08-21 | 上海智显光电科技有限公司 | Display control system with changeable display configurations |
| CN102542994A (en) * | 2012-03-14 | 2012-07-04 | 无锡聚润光电电器有限公司 | Method and device for displaying running information on buses |
| CN103971641A (en) * | 2014-05-20 | 2014-08-06 | 利亚德光电股份有限公司 | Led display screen control system |
| CN107799056A (en) * | 2017-12-13 | 2018-03-13 | 太仓鼎诚电子科技有限公司 | A kind of LED display control system based on FPGA |
| CN108181887A (en) * | 2018-02-12 | 2018-06-19 | 深圳汇通九州科技有限公司 | A kind of huge curtain controller |
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Open date: 20070207 |