CN103606363A - LCD type helmet display driving circuit based on FPGA - Google Patents
LCD type helmet display driving circuit based on FPGA Download PDFInfo
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- CN103606363A CN103606363A CN201310646854.2A CN201310646854A CN103606363A CN 103606363 A CN103606363 A CN 103606363A CN 201310646854 A CN201310646854 A CN 201310646854A CN 103606363 A CN103606363 A CN 103606363A
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Abstract
The invention discloses an LCD type helmet display driving circuit based on an FPGA. The functions of video signal decoding, video signal processing, brightness adjustment, temperature control and the like are achieved. The LCD type helmet display driving circuit comprises an FPGA control module, a video decoding module, a communication module, an LED backlight driving module, a heating control module, a D/A conversion module, a power supply module, an interface card, an LCD screen and an LED backlight board. The FPGA control module is respectively connected with the video decoding module, the communication module, the LED backlight driving module, the heating control module, the D/A conversion module and the power supply module. The LCD type helmet display driving circuit solves the problems that power consumption is too large and the board area is too large due to a conventional MCU+ASIC chip system scheme. Due to the parallelism of the FPGA implementation process, the reliability of the program execution process is greatly improved. The complexity of design and the purchase difficulty of chips are simplified. The LCD type helmet display driving circuit has the advantages of being high in resolution, high in brightness, low in power consumption, small in size, good in environment adaptability and the like.
Description
Technical field
The present invention relates to a kind of helmet display driver circuit, in particular a kind of LCD type helmet display driver circuit based on FPGA.
Background technology
Along with scientific and technical development, the type of Helmet Mounted Display (Head Mounted Display, HMD) is more and more.There is the series of problems such as weight and power supply high pressure in early stage CRT Helmet Mounted Display, will be substituted by the display of other types, and wherein LCD screen has the features such as high-contrast, low-power consumption, small size and light weight, is very suitable for the application of Helmet Mounted Display.
Because LCD screen is non-active illuminating display device, need additional backlight luminous, the information showing on LCD could be presented.In addition, Helmet Mounted Display requires to be operated in very wide temperature range (45 ℃～-60 ℃), but liquid crystal easily freezes at low temperatures, cause and show the problems such as image is slow, so, in order to meet the thermal adaptability of Helmet Mounted Display, will control liquid crystal display temperature, and make it be operated in suitable temperature range.Therefore, the display driver of LCD screen mainly comprises the driving of part: LCD screen, and the driving of LED-backlit and temperature are controlled.
Conventional LCD Helmet Mounted Display is divided into two main control sections according to functions difference, and wherein, the driving of LED-backlit, temprature control unit relate to state acquisition and control, and data volume is little, and calculated amount is large, adopts MCU controller to realize more; The drive part of LCD screen, relates to the control etc. of driving signal of collection, processing and the LCD of a large amount of video datas, adopts the asic chip of specific Yuan Ping producer to realize more.There is following problem in this design proposal: (1) whole system exists two main control chips, causes the increase of power consumption and plank area; (2) implementation of controller is one by one the execution of statement, under rugged environment, there will be the problem of program fleet; (3) LCD that Helmet Mounted Display is used mostly is import device, external more responsive to its relevant technology, and technology is blocked, and is difficult to find the data of complete special-purpose ASIC, and the difficulty of design is increased and cycle lengthening.(4) due to the improvement of design and the variation of international form, the purchase of special-purpose asic chip existing problems.
Along with the development of microelectric technique and semiconductor technology, make the function of FPGA from strength to strength in recent years, can meet the realization of self-defined circuit function, automatically in control and vision signal processing, be all widely used.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of LCD type helmet display driver circuit based on FPGA is provided, realized vision signal decoding, brightness regulation, the functions such as temperature control.
The present invention is achieved by the following technical solutions, the present invention includes FPGA control module, video decode module, communication module, LED-backlit driver module, heating control module, D/A conversion module, power module, interface card, LCD screen, LED-backlit plate;
Described FPGA control module is connected with power module with video decode module, communication module, LED-backlit driver module, heating control module, D/A conversion module respectively; Described video decode module is converted into digital rgb signal by the vision signal of interface card input, is then input to FPGA control module;
Described communication module completes the communication between host computer and FPGA control module, realizes level and transforms, and the communication signal that interface is entered is converted into LVTTL signal for the identification of FPGA control module and processes;
The brightness adjusting data that described LED-backlit driver module receives according to communication module, adjust light modulation PWM dutycycle, realize the adjusting to backlight illumination;
Described heating control module realizes low-temperature heat function;
Described D/A conversion module is realized digital video to the conversion of analog video, for LCD screen provides vision signal;
Described LCD screen is provided with temperature sensor and well heater, and described temperature sensor is connected with heating control module respectively with well heater;
Described power module is respectively FPGA control module, video decode module, communication module, LED-backlit driver module, heating control module, D/A conversion module, LCD screen, LED-backlit plate, temperature sensor and well heater power supply is provided;
Described interface card is used for transmitting extraneous video, power supply and communication signal.
As one of optimal way of the present invention, the input video resolution of described video decode module is 1400X1050.
As one of optimal way of the present invention, that described communication module adopts is semiduplex RS422, and baud rate is 9600bit/s.
As one of optimal way of the present invention, the resolution of described LCD screen is 1400X1050.
The present invention has the following advantages compared to existing technology: the invention solves the excessive and excessive problem of plank area of power consumption that conventional MCU+ASIC chip system scheme causes; Due to the concurrency of FPGA implementation procedure, greatly improved the reliability of program process; The complexity of design and a buying difficult problem for chip have been simplified; There is high resolving power, high brightness, the feature such as low in energy consumption, volume is little, and environment-adaptive type is good.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is the drive principle figure of LED-backlit driver module.
Embodiment
Below embodiments of the invention are elaborated, the present embodiment is implemented take technical solution of the present invention under prerequisite, provided detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
As shown in Figure 1, the present embodiment comprises FPGA control module 1, video decode module 2, communication module 3, LED-backlit driver module 4, heating control module 5, D/A conversion module 6, power module 7, interface card 8, LCD screen 9, LED-backlit plate 10; Described FPGA control module 1 is connected with video decode module 2, communication module 3, LED-backlit driver module 4, heating control module 5, D/A conversion module 6 and power module 7 respectively; The power supply of FPGA control module 1 is+3.3V ,+2.5V or+1.2V, FPGA control module 1, by communication module 3, receives and carries out light modulation instruction, controls LED-backlit driver module 4 circuit workings, carries out the PWM light modulation of LED-backlit plate 10; FPGA control module 1 is also accepted the signal of temperature sensor, controls heating control module 5, under low temperature condition, LCD screen 9 is heated, and realizes temperature and controls; FPGA control module 1 receiver, video decoder module 2, the digital rgb signal of output, samples to input signal, synchronization process, and receive instruction according to communication module 3, carry out contrast, gamma correction processing; The data of processing output to D/A conversion module 6, complete digital-to-analogue and transform, and the video receiving is normally shown on LCD screen 9.
Described video decode module 2 realizes video decode function, and the vision signal of input is converted into digital rgb signal that FPGA can input and row, field synchronization, clock signal etc., and input video resolution is 1400X1050;
Described communication module 3 completes the communication between host computer and FPGA control module 1, realizes level and transforms, and the communication signal that interface is entered is converted into LVTTL signal for 1 identification of FPGA control module; The employing of communication be semiduplex RS422, baud rate is 9600bit/s, mainly receives dimmer command and Video processing order, makes Helmet Mounted Display reach best display effect.
The brightness adjusting data that described LED-backlit driver module 4 receives according to communication module 3, adjust light modulation PWM dutycycle, realize the adjusting to backlight illumination; Drive principle as shown in Figure 2;
Described heating control module 5 realizes low-temperature heat function, guarantees that LCD screen 9 can work at low temperatures, and heating control module 5 gathers environment temperature, when temperature is lower than set temperature value, heating hardware protection dot circuit is opened, and produces temperature adjustment pwm signal simultaneously, realizes temperature and regulates;
Described D/A conversion module 6 is realized digital video to the conversion of analog video, for LCD provides vision signal, pixel data in FPGA control module 1 after treatment, export to D/A conversion module 6, carry out digital-to-analogue conversion, according to LCD screen 9 pixel data need to be divided into 12 tunnels, through 12 road D/A conversion modules 6, produce and drive screen 12 used road pixel voltage signal;
Described LCD screen 9 is display medium, and resolution is 1400X1050, and employing analog video signal is signaling interface, and LCD screen 9 is provided with temperature sensor 901 and well heater 902, and described temperature sensor 901 is connected with heating control module 5 respectively with well heater 902; Because temperature is influential to the display characteristic of liquid crystal molecule, when low temperature, need to heat it, heater switch is only just opened below the low temperature of an appointment, and has designed heating hardware protection circuit, in case normal temperature heating;
Described LED-backlit plate 10 provides backlight for display medium LCD shields 9;
Described power module 7 is respectively FPGA control module 1, video decode module 2, communication module 3, LED-backlit driver module 4, heating control module 5, D/A conversion module 6, LCD screen 9, LED-backlit plate 10, temperature sensor 901 and well heater 902 power supply is provided;
Described interface card 8 is crosslinked devices of Circuits System and extraneous signal, for transmitting extraneous video, power supply and communication signal.
Claims (4)
1. the LCD type helmet display driver circuit based on FPGA, it is characterized in that, comprise that FPGA control module (1), video decode module (2), communication module (3), LED-backlit driver module, heating control module (5), D/A conversion module (6), power module (7), interface card (8), LCD shield (9), LED-backlit plate (10);
Described FPGA control module (1) is connected with video decode module (2), communication module (3), LED-backlit driver module, heating control module (5), D/A conversion module (6) and power module (7) respectively; Described video decode module (2) is converted into digital rgb signal by the vision signal of interface card (8) input, is then input to FPGA control module (1);
Described communication module (3) completes the communication between host computer and FPGA control module (1), realizes level and transforms, and the communication signal that interface is entered is converted into LVTTL signal for FPGA control module (1) identification and processes;
The brightness adjusting data that described LED-backlit driver module receives according to communication module (3), adjust light modulation PWM dutycycle, realize the adjusting to backlight illumination;
Described heating control module (5) realizes low-temperature heat function;
Described D/A conversion module (6) is realized digital video to the conversion of analog video, for LCD screen (9) provides vision signal;
Described LCD screen (9) is provided with temperature sensor (901) and well heater (902), and described temperature sensor (901) is connected with heating control module (5) respectively with well heater (902);
Described power module (7) is respectively FPGA control module (1), video decode module (2), communication module (3), LED-backlit driver module, heating control module (5), D/A conversion module (6), LCD screen (9), LED-backlit plate (10), temperature sensor (901) and well heater (902) power supply is provided;
Described interface card (8) is for transmitting extraneous video, power supply and communication signal.
2. the LCD type helmet display driver circuit based on FPGA according to claim 1, is characterized in that, the input video resolution of described video decode module (2) is 1400X1050.
3. the LCD type helmet display driver circuit based on FPGA according to claim 1, is characterized in that, that described communication module (3) adopts is semiduplex RS422, and baud rate is 9600bit/s.
4. the LCD type helmet display driver circuit based on FPGA according to claim 1, is characterized in that, the resolution of described LCD screen (9) is 1400X1050.
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| CN201310646854.2A CN103606363A (en) | 2013-12-04 | 2013-12-04 | LCD type helmet display driving circuit based on FPGA |
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| CN201310646854.2A CN103606363A (en) | 2013-12-04 | 2013-12-04 | LCD type helmet display driving circuit based on FPGA |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109375666A (en) * | 2018-12-04 | 2019-02-22 | 中航华东光电有限公司 | Low-temperature heat control method based on FPGA |
| CN112655041A (en) * | 2018-10-22 | 2021-04-13 | 三星电子株式会社 | Display device and control method thereof |
| CN113963655A (en) * | 2021-10-29 | 2022-01-21 | 中航华东光电有限公司 | High-reliability airborne display control system based on FPGA |
| CN114299839A (en) * | 2022-01-06 | 2022-04-08 | 苏州蓝石新动力有限公司 | Segment code screen driving system and segment code screen driving method |
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| CN114299839B (en) * | 2022-01-06 | 2024-04-30 | 苏州蓝石新动力有限公司 | Segment code screen driving system and segment code screen driving method |
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Address after: 241000 Huaxia science and Technology Park, hi tech Development Zone, Yijiang District, Wuhu, Anhui Applicant after: Avic Huadong Photoelectric Co., Ltd. Address before: 230001 Huaxia science and Technology Park, hi tech Development Zone, Yijiang District, Wuhu, Anhui Applicant before: Avic Huadong Photoelectric Co., Ltd. |
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Application publication date: 20140226 |