CN207938293U - A kind of all-colour LED array drive device based on FPGA - Google Patents

Abstract

The utility model discloses a kind of all-colour LED array drive device based on FPGA, including power supply, HDMI interface and receive chip, USB interface and bridging chip, PCIe interface and bridging chip, FPGA, FLASH, DDR3SDRAM, system monitoring module, LED array module, human-computer interaction module.The device is using HDMI USB combination computer terminal host computers as input video source；Using PCIe high-speed interfaces as the communication mode cascaded between multiple utility model devices when extending；Using FPGA as control core and Digital Image Processing core；System monitoring module can make abnormal condition and reasonably handle and report to user for monitoring system running state.Present apparatus circuit is simple, of low cost, refreshing is efficient, and conducive to extension.

Description

A kind of all-colour LED array drive device based on FPGA

Technical field

The utility model belongs to LED driving equipments field, is related to a kind of all-colour LED array drive device more particularly to one All-colour LED array drive device of the kind based on FPGA.

Background technology

With the development of modern multimedia, full-color LED display array is widely applied.Each all-colour LED is by one A red light emitting diodes, a green LED, a blue LED composition.By controlling each luminous two The brightness of pole pipe can blend all colours.Controlling light-emitting diode luminance, there are two types of methods, firstly, since light emitting diode Brightness is almost directly proportional to the electric current for flowing through light emitting diode, thus can flow through the electric current of light emitting diode by change to control Light-emitting diode luminance.Secondly as there are vision delays for human eye, therefore the method that can also use pulsewidth modulation realizes brightness control The high-frequency PWM wave duty ratio of system, i.e. periodically-varied driving light emitting diode, realizes brightness control.

Full-color LED display array generally adds special all-colour LED driver schemes using MCU currently on the market, with serial 8* As can be seen that the program passes through control for 8*3 RGB data inputs, the channels 8*3 constant current output all-colour LED driving chip DM163 System flows through the electric current of light emitting diode to realize light-emitting diode luminance control, there is type of drive is simple, and development difficulty is low etc. While advantage, there is also following disadvantages.Firstly, since special LED driver is expensive, especially in high-resolution applications field It needs to use a large amount of LED drivers under scape, causes the program with high costs.Secondly, special all-colour LED driver passes through serial defeated Enter each light-emitting diode luminance information and achieve the purpose that each LED of control, since MCU serial line interfaces are limited, the program is usual The data transfer mode for being cascaded and being shared a serial input interface using plurality of LED driver, which results in refresh efficiency Low problem.Finally, program system design underaction needs to change by a relatively large margin when changing LED array resolution ratio The design of control system is unfavorable for extension and improving performance.

Invention content

The purpose of the utility model is to overcome the deficiencies in the prior art, provide a kind of all-colour LED array based on FPGA Drive scheme to simplify circuit, reduce cost, raising refreshing efficiency, and enhances autgmentability.

The above-mentioned purpose of the utility model is achieved by following technical solution：

A kind of all-colour LED array drive device based on FPGA, including power module, HDMI interface, HDMI reception chip, USB interface, USB bridging chips, PCIe interface, PCIe bridging chips, FPGA, FLASH, DDR3SDRAM, system monitoring module, LED array module and human-computer interaction module；HDMI interface and HDMI for receiving video input signals receive chip and FPGA Connection, USB interface and USB bridging chips for coordinating with computer terminal host computer are connect with FPGA, and being used for will be multiple described The PCIe interface and PCIe bridging chips that extension is cascaded between driving device are connect with FPGA, for coordinating FPGA to realize digitized map As processing and to entire driving device control FLASH, DDR3SDRAM connect respectively with FPGA, LED array module, be used for into The human-computer interaction module of row user setting and system monitoring module for monitoring system running state are connect with FPGA respectively.System System monitoring module is for monitoring system running state so that utility model device can make abnormal condition rational processing And it reports to user.Include the monitoring to LED temperature, system humidity, current loading, can shorten LED since LED temperature is excessively high makes With the service life, when temperature is higher, utility model device can suitably reduce screen intensity.

Further, it is communicated by spi bus agreement between human-computer interaction module and FPGA.Human-computer interaction module is User realizes the interface controlled this system, passes through SPI interface bus communication between the module and FPGA.

Further, LED array module includes three or eight decoders, darlington transistor array and all-colour LED, and decoder is adopted With 74LS138, darlington transistor array uses M54564FP, all-colour LED to use common-anode RGB LED.All-colour LED array mould Group is made of three or eight decoders, darlington array and all-colour LED.Decoder uses low-cost 74LS138, effect master If compressing the quantity of ranks control line.Darlington transistor array use M54564FP, effect be improve driving capability. All-colour LED uses common-anode RGB LED.

Further, HDMI receives the SiI1127A that chip selects Lattice companies.HDMI interface needs to show for receiving The vision signal shown, HDMI interface are the high-definition multimedia interface being widely used at present, utility model device and mesh The preceding all-colour LED array drive scheme generally used in the market is different, and utility model device is without installation for receiving video The sending card of signal, adjustment resolution ratio, divided frame etc., and compatible all HDMI video signals no more than 1080P resolution ratio Source is truly realized plug and play.HDMI receives chip and selects Lattice company SiI1127A, be a double ports HDMI input, The HDMI receiver of 36 RGB datas output, can receive 12 Deep Color vision signals of up to 1080p@60Hz.

Further, USB bridging chips select the CYUSB3065 of Cypress companies.On USB interface coupled computer end Position machine, not only can need to vision signal to be shown be sent to utility model device from computer terminal, moreover it is possible to pass through calculating Generator terminal host computer is configured utility model device.USB bridging chips select the CYUSB3065 of Cypress companies, the core Piece is not only to meet the 5Gbps USB3.0PHY of PIPE3.0, and is one piece and is integrated with 32 ARM926EJ-S microprocessors USB bridge controllers.MIPI CSI-2 interface standard transmission datas are used between USB bridging chips and FPGA.The interface standard It is the video camera serial interface standard defined by mobile industrial processor interface (MIPI) association, in high bandwidth string line Send image data.When for the first time by utility model device by USB connection computer host computers, host computer will be enumerated automatically USB bridging chips supplier ID, and firmware and USB descriptors are downloaded by USB interface, later, utility model device can be made It is enumerated again for the device that download information defines, which occurs immediately when device is inserted into, and removes installation manually from and drove Journey, it is user-friendly.

Further, PCIe bridging chips select the CH368 of Qin Heng companies.PCIe interface is used to work as multiple the utility model Transmission data when cascading and extend between device.It is a connection that PCIe bridging chips, which select the CH368 of Qin Heng companies, CH368, The common interface chip of PCI-Express buses supports I/O port mappings, memory mapping, expansion ROM and interruption. High-speed PCI E general line systems are easy easy-to-use 32 active parallel interfaces similar to isa bus by CH368.

Further, the DDR3SDRAM uses the DDR3SDRAM chips MT41K64M16TW- of two panels Micron companies 107AIT.FLASH is also stored with Chinese commonly used word character library and some interface icons other than the configuration information for storing FPGA Data, for providing the user with visualization man-machine interactive interface.In addition, information-setting by user is also stored in FLASH, to solve to be The problem of system needs to reset after due to delay machine restarting.Utility model device is using two panels Micron companies DDR3SDRAM chips MT41K64M16TW-107AIT is used for buffered video data.

The utility model has the advantage that：

1, the utility model controls the scheme of LED luminance instead of special LED driver in such a way that FPGA exports PWM wave Scheme simplifies circuit, saves cost.

2, the utility model is installed with the need generally used currently on the market for connecing using HDMI as input video source The sending card scheme for receiving vision signal, adjustment resolution ratio, divided frame etc. is compared, and video input mode is simple and general.And And the utility model can also more improve ease for use using USB combination computer terminal host computers as input video source.

3, the utility model gives full play to FPGA concurrencys, and there is no pass through serial data interface to the cascade LED of multi-disc The problem of luminance information being transmitted in driver and leading to inefficiency, thus refresh rate can be improved, optimize display effect.

4, since FPGA has big advantage in terms of Digital Image Processing efficiency, thus increase contrast, form and aspect, color The pictures regulatory function such as saturation degree, antialiasing, denoising, provides the display effect that can freely customize to the user.

5, system monitoring module is for monitoring system running state so that utility model device can make abnormal condition Go out and reasonably handle and report to user, improve Fault Tolerance, extends system service life.

Description of the drawings

Fig. 1 is the hardware system structure schematic diagram of the utility model；

Fig. 2 is the utility model FPGA architecture design diagram；

Fig. 3 is the utility model all-colour LED array modular structure schematic diagram.

Specific implementation mode

The utility model in essence content is specifically introduced with reference to the accompanying drawings and examples, but this practicality is not limited with this Novel protection domain.

The utility model provides a kind of all-colour LED array drive device based on FPGA.Its hardware system structure such as Fig. 1 institutes Show, including power module, HDMI interface, HDMI receive chip, USB interface, USB bridging chips, PCIe interface, PCIe and bridge core Piece, FPGA, FLASH, DDR3SDRAM, system monitoring module, LED array module, human-computer interaction module.

HDMI interface needs vision signal to be shown for receiving, and HDMI interface is the fine definition being widely used at present Multimedia interface, utility model device is different from the all-colour LED array drive scheme generally used currently on the market, this practicality Sending card of the new device without installation for receiving vision signal, adjustment resolution ratio, divided frame etc., and it is compatible all little In the HDMI video signal source of 1080P resolution ratio, it is truly realized plug and play.HDMI receives chip and selects Lattice companies SiI1127A, the chip are the HDMI receivers of a double ports HDMI input, 36 RGB data output.It can receive height Up to 12 Deep Color vision signals of 1080p@60Hz.

USB interface coupled computer end host computer, not only can need to vision signal to be shown from computer terminal send To utility model device, moreover it is possible to be configured to utility model device by computer terminal host computer.USB bridging chips select With the CYUSB3065 of Cypress companies, which is not only to meet the 5Gbps USB3.0PHY of PIPE3.0, and is one piece It is integrated with the USB bridge controllers of 32 ARM926EJ-S microprocessors.MIPI is used between USB bridging chips and FPGA CSI-2 interface standard transmission datas.The interface standard is the video camera defined by mobile industrial processor interface (MIPI) association Serial interface standard, for sending image data on high bandwidth string line.Utility model device is connected by USB for the first time When computer host computer, host computer enumerates USB bridging chips supplier ID by automatic, and downloads firmware and USB by USB interface Descriptor, later, utility model device can be again enumerated as the device that download information defines, which is inserted into device When occur immediately, remove from manually installation driving process, it is user-friendly.

PCIe interface is used for the transmission data when cascading and extending between multiple utility model devices.PCIe bridging chips It is the common interface chip of a connection PCI-Express bus to select the CH368 of Qin Heng companies, CH368, supports the ports I/O Mapping, memory mapping, expansion ROM and interruption.High-speed PCI E general line systems are easy to be easy-to-use similar to ISA by CH368 32 active parallel interfaces of bus.

FLASH is also stored with Chinese commonly used word character library and some surface charts other than the configuration information for storing FPGA Data are marked, for providing the user with visualization man-machine interactive interface.In addition, information-setting by user is also stored in FLASH, to solve The problem of system needs to reset after due to delay machine restarting.Utility model device is using two panels Micron companies DDR3SDRAM chips MT41K64M16TW-107AIT is used for buffered video data.

System monitoring module is for monitoring system running state so that utility model device can make abnormal condition Reasonably handles and report to user.Include the monitoring to LED temperature, system humidity, current loading, since LED temperature is excessively high LED service lifes can be shortened, when temperature is higher, utility model device can suitably reduce screen intensity.Human-computer interaction module It is that user realizes the interface controlled this system, passes through SPI interface bus communication between the module and FPGA.

FPGA inside structures design as shown in Fig. 2, including PLL, usb data resolver, video source multiple selector, RGB Turn YCbCr444, DDR3IP, picture unit for scaling, picture cutting unit, toning unit, screen processing, display controller, PCIe transmission control unit (TCU)s, FLASH controller, menu interface manager, instruction accessing unit, ALPHA colour mixtures unit, RGB turn YCbCr444, frame parser, FIFO, scanning monitor, row encoder, row gate, row resolver, row encoder, PWM are mono- Member, master controller, SPI interface, SPI controller, command decoder, command encoder, monitoring module interface.

PLL provides clock for each module.Usb data resolver will be passed from computer terminal host computer by USB bridging chips The defeated data to FPGA are parsed, i.e., the data flow of packing are separated into video data and control number according to certain rule According to, and carry out the processes such as verification of shaking hands.Control data after separation are transferred to master controller, and video data transmission is to video Source multiple selector.Video source multiple selector is controlled by master controller, determines utility model device using HDMI as video Source is still using USB video datas as video source.RGB turns YCbCr444 and is responsible for rgb video data carrying out color space transformation, It is transformed into YCbCr444 video datas and DDR3SDRAM is stored in by DDR3IP, in order to subsequent digital image processing.Picture contracts It puts unit and the video data being stored in DDR3SDRAM is zoomed in and out into processing to adapt to show under the control of display controller Demand.When cascading extension between multiple utility model devices, each utility model device should show video input picture A part, the effect of picture cutting unit is the picture that should show the utility model device under the control of display controller Face is split.Unit of mixing colours can change the display effect of picture according to user demand, including to brightness, contrast, form and aspect, The adjusting of color saturation etc..Screen processing advanced optimizes display effect according to user setting, including antialiasing, sharp Change, denoising etc..

When cascading extension between multiple utility model devices, PCIe transmission control unit (TCU)s will control data and in addition to the reality Video data other than the video data needed with new device is sent to remaining utility model dress by PCIe bridging chips It sets, to achieve the purpose that multiple utility model device collaborations show same video pictures.

Menu interface manager will generate the required Chinese character dot matrix data of visualized graph interface by FLASH controller Visualized graph interface is read out and generated from FLASH with icon data, human-computer interaction is carried out convenient for user.Instruction accessing Information-setting by user is stored into FLASH by FLASH controller or is read from FLASH information-setting by user by unit.ALPHA Colour mixture unit by by toning unit and screen processing treated video data and menu interface manager generate can Depending on change graphical interfaces data investigation be shown on same picture, with meet user in the case where having little influence on video playing into The requirement of row human-computer interaction.YCbCr444 turns RGB by the video data after superposition by YCbCr444 color space conversions to RGB coloured silks The colour space.Video data stream is packaged into frame matrix table as unit of frame and is stored in FIFO by frame parser.

Scanning monitor reads frame matrix table from FIFO and generates row control information and row display information, row control information It is transferred to row encoder to be encoded, row gate is controlled according to coding result later, row gate is connected to all-colour LED array The row control line of module.Row show that information is transferred to row resolver, and row resolver generates row control information and light emitting diode is bright Information is spent, row control information is transferred to row encoder and is encoded.PWM units are according to row encoder coding result and are corresponding to it Light-emitting diode luminance information export the PWM wave of certain duty ratio, PWM units connect the row control of all-colour LED array module Line.Brightness control to any one LED on all-colour LED array module can be realized by ranks control line.

Master controller is not only responsible for collaborative work and responsible transmitting control data and execution between each module of coordination system Control instruction etc..Wherein coordinate each module cooperative work of system mainly by display controller, PCIe transmission control unit (TCU)s, menu The control of interface management is realized.By SPI interface bus communication between human-computer interaction module and FPGA, FPGA as SPI from Machine, human-computer interaction module is as SPI hosts.The interface bus be used for by information-setting by user be transferred to utility model device and Current setting information is fed back into user.SPI interface and SPI controller are responsible for sending an instruction to according to SPI protocol man-machine Interaction module receives instruction from human-computer interaction module.The instruction that command decoder is used to receive from human-computer interaction module Master controller is transferred to after decoding, command encoder after the instruction encoding in master controller for will be sent to human-computer interaction mould Group.System monitoring module items monitoring data are transferred to bus control unit by monitoring module interface, and bus control unit is according to monitoring Data make corresponding operating.

All-colour LED array modular structure as shown in figure 3, its mainly by three or eight decoders, darlington array and all-colour LED Composition.Decoder uses low-cost 74LS138, effect mainly to compress the quantity of ranks control line.Darlington crystal Pipe array use M54564FP, effect be improve driving capability.All-colour LED uses common-anode RGB LED.

The effect of above-described embodiment is specifically to introduce the essentiality content of the utility model, but those skilled in the art answer When knowing, the scope of protection of the utility model should not be confined to the specific embodiment.

Claims (8)

1. a kind of all-colour LED array drive device based on FPGA, it is characterised in that：Including power module, HDMI interface, HDMI Receive chip, USB interface, USB bridging chips, PCIe interface, PCIe bridging chips, FPGA, FLASH, DDR3SDRAM, system Monitor module, LED array module and human-computer interaction module；HDMI interface and HDMI for receiving video input signals receive core Piece is connect with FPGA, and the USB interface and USB bridging chips for coordinating with computer terminal host computer are connect with FPGA, and being used for will The PCIe interface and PCIe bridging chips that extension is cascaded between multiple driving devices are connect with FPGA, for coordinating FPGA real Existing Digital Image Processing and FLASH, DDR3SDRAM for controlling entire driving device are connect with FPGA respectively, LED array mould Group, the human-computer interaction module for carrying out user setting and for monitor the system monitoring module of system running state respectively with FPGA connections.

2. all-colour LED array drive device according to claim 1, it is characterised in that：Human-computer interaction module and FPGA it Between communicated by spi bus agreement.

3. all-colour LED array drive device according to claim 1, it is characterised in that：LED array module is translated including three or eight Code device, darlington transistor array and all-colour LED.

4. all-colour LED array drive device according to claim 3, it is characterised in that：Decoder uses 74LS138, reaches Islington transistor array uses M54564FP, all-colour LED to use common-anode RGB LED.

5. all-colour LED array drive device according to claim 1, it is characterised in that：HDMI receives chip and selects The SiI1127A of Lattice companies.

6. all-colour LED array drive device according to claim 1, it is characterised in that：USB bridging chips are selected The CYUSB3065 of Cypress companies.

7. all-colour LED array drive device according to claim 1, it is characterised in that：PCIe bridging chips select perseverance of oozing The CH368 of company.

8. all-colour LED array drive device according to claim 1, it is characterised in that：The DDR3SDRAM uses two panels The DDR3SDRAM chips MT41K64M16TW-107AIT of Micron companies.