CN201984784U - LED (light-emitting diode) image-text screen control card circuit - Google Patents
LED (light-emitting diode) image-text screen control card circuit Download PDFInfo
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- CN201984784U CN201984784U CN2011200704798U CN201120070479U CN201984784U CN 201984784 U CN201984784 U CN 201984784U CN 2011200704798 U CN2011200704798 U CN 2011200704798U CN 201120070479 U CN201120070479 U CN 201120070479U CN 201984784 U CN201984784 U CN 201984784U
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Abstract
The utility model provides an LED image-text screen control card circuit, which comprises a microprocessor circuit, a CPLD (Complex Programable Logic Device) control circuit, a network control circuit, a serial communication circuit, an external SRAM (Static Random Access Memory) extension circuit, a Flash extension circuit, an SD (Secure Digital) card extension circuit and a power circuit; the microprocessor circuit is respectively connected with the CPLD control circuit, the network control circuit, the serial communication circuit, the external SRAM extension circuit, the Flash extension circuit and the SD card extension circuit; and the power circuit is respectively connected with the microprocessor circuit, the CPLD control circuit, the network control circuit, the serial communication circuit, the external SRAM extension circuit, the Flash extension circuit and the SD card extension circuit. The circuit has the advantages of scientific design, low power consumption, high working efficiency, high data processing capability, good display effect and stable operation performance.
Description
Technical field
The utility model relates to a kind of picture and text display control circuit, specifically, relates to a kind of LED picture and text screen control card circuit.
Background technology
LED picture and text screen control card is the core control section of LED graphic display screen, it mainly acts on is video data and the control setting that is used to receive PC end Control Software, thereby according to the content that has configured, at times, the content and the special efficacy of dividing the broadcast of play to store; LED picture and text screen control card is asynchronous control card, is different from the synchro control card, once setting, does not need extra demonstration input equipment off line to control, and is applicable to the various places that need off-line display, such as highway, bank, subway, market etc.
The design of existing LED picture and text screen control card mainly divides following a few class: 1, use 51 series monolithic systems, 2, use 51 series monolithics and CPLD system, 3, use the ARM core system, 4, use the fpga core system; Existing LED picture and text screen control card exists mostly that data processing is slow, special efficacy show not smooth, be difficult to handle shortcomings such as big video data, poor stability.
For solving the problem of above existence, people are seeking a kind of desirable technical solution always.
Summary of the invention
The utility model is at the deficiencies in the prior art, provides a kind of design science, low-power consumption, high efficiency, data-handling capacity is strong, display effect good, the LED picture and text of stable work in work screen control card circuit.
The technical scheme that the utility model adopted is as follows: a kind of LED picture and text screen control card circuit, and it includes microcontroller circuit, CPLD control circuit, network control circuit, serial communication circuit, external SRAM expanded circuit, Flash expanded circuit, SD card expanded circuit and power circuit; Wherein, described microcontroller circuit connects described CPLD control circuit so that write video data in advance, refresh video data and driving LED picture and text screen and show; Described microcontroller circuit connects described network control circuit so that the peripherals network communication interface to be provided; Described microcontroller circuit connects described serial communication circuit so that peripherals serial communication interface to be provided; Described microcontroller circuit connects described external SRAM expanded circuit, described Flash expanded circuit, described SD card expanded circuit respectively so that external memory space to be provided; Described power circuit connects described microcontroller circuit, described CPLD control circuit, described network control circuit, described serial communication circuit, described external SRAM expanded circuit, described Flash expanded circuit, described SD card expanded circuit respectively so that working power to be provided.
Based on above-mentioned, it is the ARM7 controller of LPC2378 that described microcontroller circuit adopts model.
Based on above-mentioned, described CPLD control circuit comprises that model is the CPLD chip of EMP570, two display buffer chip and two data bus chip for driving that model is 74LVC245 that model is IS61C1024, wherein, described CPLD chip connects two display buffer chips so that write video data in advance and refresh video data, and described CPLD chip connects two blocks of data bus driver chips so that driving LED picture and text screen shows.
Based on above-mentioned, it is the network communication chip of DM9161A that described network control circuit adopts model.
Based on above-mentioned, it is the serial ports level transferring chip of MAX3232 and the serial ports level chip that model is MAX3243 that described serial communication circuit adopts model.
The relative prior art of the utility model has substantive distinguishing features and progress, specifically, this LED picture and text screen control card circuit adopts the 3.3V low power dissipation design, energy savings to greatest extent, and can keep system stability, it has design science, low-power consumption, high efficiency, data-handling capacity is strong, display effect good, the advantage of stable work in work.
Description of drawings
Fig. 1 is a structured flowchart of the present utility model;
Fig. 2 is the circuit theory diagrams of described microcontroller circuit;
Fig. 3 is the circuit theory diagrams of described CPLD control circuit;
Fig. 4 is the circuit theory diagrams of described external SRAM expanded circuit and described Flash expanded circuit;
Fig. 5 is the circuit theory diagrams of described SD card expanded circuit;
Fig. 6 is the circuit theory diagrams of described serial communication circuit;
Fig. 7 is the circuit theory diagrams of described power circuit;
Fig. 8 is the circuit theory diagrams of described network control circuit.
Embodiment
Below by embodiment, the technical solution of the utility model is described in further detail.
As shown in Figure 1, a kind of LED picture and text screen control card circuit, it includes microcontroller circuit, CPLD control circuit, network control circuit, serial communication circuit, external SRAM expanded circuit, Flash expanded circuit, SD card expanded circuit and power circuit;
Wherein, described microcontroller circuit connects described CPLD control circuit so that write video data in advance, refresh video data and driving LED picture and text screen and show;
Described microcontroller circuit connects described network control circuit so that the peripherals network communication interface to be provided; Described microcontroller circuit connects described serial communication circuit so that peripherals serial communication interface to be provided;
Described microcontroller circuit connects described external SRAM expanded circuit, described Flash expanded circuit, described SD card expanded circuit respectively so that external memory space to be provided;
Described power circuit connects described microcontroller circuit, described CPLD control circuit, described network control circuit, described serial communication circuit, described external SRAM expanded circuit, described Flash expanded circuit, described SD card expanded circuit respectively so that working power to be provided.
Described LED picture and text screen control card circuit can be connected through network interface or serial ports with host computer by network control circuit or serial communication circuit, receive upper computer software it is provided with data and video data, after Data Receiving finishes, it is stored in described Flash expanded circuit, the described SD card expanded circuit, uses so that off-line analysis is handled; After the off line, described LED picture and text screen control card circuit is by reading the configuration information in the storage area, clock value according to the RTC real-time clock, according to the displaying contents that is provided with in the fixing broadcast storage area of file circulation, if when having the demonstration of special efficacy, described LED picture and text screen control card circuit can be handled data in advance and then carry out special efficacy and show.
As shown in Figure 2, described microcontroller circuit is the core component of whole LED picture and text screen control card circuit, major function is to receive and handle that upper computer software provides that data and video data are set, and, deposit in the SD storage card, or be kept among the outside FLASH the data after handling, and call in the data that need as required and carry out display process, bus links by the CPLD control circuit writes display buffer, and control CPLD control circuit shows and refreshes work.
It is 32 ARM7 controllers of LPC2378 that described microcontroller circuit adopts model; This ARM7 controller is produced by NXP company, compares its integrated 512KB in-chip FLASH, 32K on-chip SRAM, 16KB Ethernet SRAM, 8KB USB SRAM, 2KB RTC SRAM with other ARM controller; Its inner also integrated peripheral interface a lot, as USB interface, the ETHNET interface, SPI, I2C, SSP, full duplex UART, SD card, RTC module in the sheet, I2S audio interface, and ADC module, DAC module and PWM module, and there is individual timer available, its peripheral interface is abundant, diverse in function, and this chip is applied to Industry Control more; The expanded function of this ARM7 controller is strong, thus the support of SD card can be provided, its not only compatible common on the market memory device, and be convenient to change, maintenance and enlarge memory space, for from now on expansion provides may.
The RTC real time clock circuit uses the low-power consumption real-time timepiece chip of model as PCF8563, adopts I2C bus communication pattern, has programmable clock pulse output, because it has advantage of low power consumption, is mainly used in portable instrument, uses the battery supply product; It is the chip that resets of MAX706R that reset circuit adopts model.
As shown in Figure 3, described CPLD control circuit is the main circuit of display driver, and it reads the video data that described microcontroller circuit is handled well from the display buffer, refresh sequential by certain scanning, and the demonstration of carrying out image refreshes work.
Described CPLD control circuit comprises that model is the CPLD chip of EMP570, two display buffer chip and two data bus chip for driving that model is 74LVC245 that model is IS61C1024, wherein, described CPLD chip connects two display buffer chips so that write video data in advance and refresh video data, and described CPLD chip connects two blocks of data bus driver chips so that driving LED picture and text screen shows.
Described CPLD control circuit is another core devices of this LED picture and text screen control card circuit, has used the CPLD chip of model as EMP570; It is that auxiliary ARM7 controller carries out the brush screen work of LED picture and text screen that this CPLD chip mainly acts on, 2 display buffer chips of CPLD chips incorporate are formed two display buffers, under the control of ARM7 controller, the demonstration of carrying out the picture and text screen on the one hand refreshes work, form data path on the other hand, untapped another block buffer is carried out data write work, like this, brush screen and write simultaneously and carry out, switch then and show, transmission, the demonstration time of data have been saved in design like this, improve refresh rate, guarantee the realization of multiple special efficacy; Simultaneously, adopt CPLD chip and the interworking of ARM7 controller, master chip ARM7 controller is freed from the work of this simple repetition of brush screen, saved the processing time of ARM7 controller master control greatly, allow it have more time to be used for the processes and displays data, can support to handle more data volume with this, can be that The whole control system is effectively stable more.
The display buffer of described CPLD control circuit is to adopt two display buffer designs, contrast CPLD display buffer system in the past, owing to added a read-write cache, make double screen and data preparation, transmission carry out simultaneously, can make scanning process not have the retardation sense, the demonstration of the big image of may command, and can realize more special efficacy, especially can realize the split screen display effect.
Model is that the CPLD chip of EMP570 is the CPLD chip of a new generation, it not only has more I/O interface, and have more compatibility, higher work all the time, cheaper cost and lower power consumption, and its small size encapsulation, can save the size of pcb board, provide convenience, and the CPLD that uses in the control card design at present is bigger as size for the miniature design of control card, and resource is less, expansion after being unfavorable for.
As shown in Figure 4 and Figure 5, the function of described SD card expanded circuit, described FLASH expanded circuit and described external SRAM expanded circuit is to provide external memory space for the ARM7 controller;
Because the ARM7 controller the is integrated driving register of SD card, the chip for driving that SD card expanded circuit can be saved the SD card based on the SD card of ARM7 controller inside only needs to use a spot of peripheral components and simple circuit can constitute the application function of SD card;
It is the serial FLASH storage chip of MX25L1605 that described FLASH expanded circuit adopts model, and this chip can be stored the data that some configuration informations, character library information, power down need preserve etc.;
The acp chip of described external SRAM expanded circuit is that model is the static SRAM of IS63LV1024, and its capacity is 128Kbytes, and its effect is in order to provide more RAM storage space to handle and receive corresponding video data for the ARM7 controller.
As shown in Figure 6, described serial communication circuit employing model is the serial ports level transferring chip of MAX3232 and the serial ports level chip that model is MAX3243; Because the ARM7 controller has serial ports and 3 asynchronous serial ports that meet the 16C550 industrial standard with complete MODEM interface; so adopting model is the 3.3V serial ports level transferring chip of MAX3232 and the 3.3V serial ports level chip that model is MAX3243; like this She Ji benefit be can be directly and ARM7 controller level be complementary; do not need extra level conversion protection, make circuit performance more reliable and more stable.
As shown in Figure 7, described power circuit uses the SPX1117-X series LDO voltage regulator chip of high stable, exportable 3.3V and 5V burning voltage.
As shown in Figure 8, described network control circuit employing model is the network communication chip of DM9161A; This chip is the physical layer network transceiver, and it has low-power consumption, high performance advantage, and it can realize the 10M/100M ethernet feature by Network Interface Module in RMII interface and the ARM7 controller sheet.
Should be noted that at last: above embodiment only is not intended to limit in order to the explanation the technical solution of the utility model; Although with reference to preferred embodiment the utility model is had been described in detail, those of ordinary skill in the field are to be understood that: still can make amendment or the part technical characterictic is equal to replacement embodiment of the present utility model; And not breaking away from the spirit of technical solutions of the utility model, it all should be encompassed in the middle of the technical scheme scope that the utility model asks for protection.
Claims (5)
1. LED picture and text shield the control card circuit, it is characterized in that: this LED picture and text screen control card circuit includes microcontroller circuit, CPLD control circuit, network control circuit, serial communication circuit, external SRAM expanded circuit, Flash expanded circuit, SD card expanded circuit and power circuit; Wherein, described microcontroller circuit connects described CPLD control circuit so that write video data in advance, refresh video data and driving LED picture and text screen and show; Described microcontroller circuit connects described network control circuit so that the peripherals network communication interface to be provided; Described microcontroller circuit connects described serial communication circuit so that peripherals serial communication interface to be provided; Described microcontroller circuit connects described external SRAM expanded circuit, described Flash expanded circuit, described SD card expanded circuit respectively so that external memory space to be provided; Described power circuit connects described microcontroller circuit, described CPLD control circuit, described network control circuit, described serial communication circuit, described external SRAM expanded circuit, described Flash expanded circuit, described SD card expanded circuit respectively so that working power to be provided.
2. LED picture and text screen control card circuit according to claim 1, it is characterized in that: it is the ARM7 controller of LPC2378 that described microcontroller circuit adopts model.
3. LED picture and text screen control card circuit according to claim 1 and 2, it is characterized in that: described CPLD control circuit comprises that model is the CPLD chip of EMP570, two display buffer chip and two data bus chip for driving that model is 74LVC245 that model is IS61C1024, wherein, described CPLD chip connects two display buffer chips so that write video data in advance and refresh video data, and described CPLD chip connects two blocks of data bus driver chips so that driving LED picture and text screen shows.
4. LED picture and text screen control card circuit according to claim 1 and 2, it is characterized in that: it is the network communication chip of DM9161A that described network control circuit adopts model.
5. LED picture and text screen control card circuit according to claim 1 and 2, it is characterized in that: it is the serial ports level transferring chip of MAX3232 and the serial ports level chip that model is MAX3243 that described serial communication circuit adopts model.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200704798U CN201984784U (en) | 2011-03-17 | 2011-03-17 | LED (light-emitting diode) image-text screen control card circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200704798U CN201984784U (en) | 2011-03-17 | 2011-03-17 | LED (light-emitting diode) image-text screen control card circuit |
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| Publication Number | Publication Date |
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| CN201984784U true CN201984784U (en) | 2011-09-21 |
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| CN2011200704798U Expired - Fee Related CN201984784U (en) | 2011-03-17 | 2011-03-17 | LED (light-emitting diode) image-text screen control card circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104219458A (en) * | 2013-06-03 | 2014-12-17 | 练成惠 | High-definition multimedia LED display screen control system |
| CN105361844A (en) * | 2015-12-07 | 2016-03-02 | 朱春垒 | Multifunctional otorhinolaryngologic probing therapeutic apparatus |
| CN109036263A (en) * | 2018-09-13 | 2018-12-18 | 天长市辉盛电子有限公司 | LED display image processing apparatus and its processing method |
| CN112992044A (en) * | 2019-11-29 | 2021-06-18 | 西安诺瓦星云科技股份有限公司 | Display screen controller, display screen control system and LED display system |
-
2011
- 2011-03-17 CN CN2011200704798U patent/CN201984784U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104219458A (en) * | 2013-06-03 | 2014-12-17 | 练成惠 | High-definition multimedia LED display screen control system |
| CN105361844A (en) * | 2015-12-07 | 2016-03-02 | 朱春垒 | Multifunctional otorhinolaryngologic probing therapeutic apparatus |
| CN109036263A (en) * | 2018-09-13 | 2018-12-18 | 天长市辉盛电子有限公司 | LED display image processing apparatus and its processing method |
| CN112992044A (en) * | 2019-11-29 | 2021-06-18 | 西安诺瓦星云科技股份有限公司 | Display screen controller, display screen control system and LED display system |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| PP01 | Preservation of patent right | ||
| PP01 | Preservation of patent right |
Effective date of registration: 20181227 Granted publication date: 20110921 |
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| PD01 | Discharge of preservation of patent | ||
| PD01 | Discharge of preservation of patent |
Date of cancellation: 20210317 Granted publication date: 20110921 |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110921 Termination date: 20190317 |