LCD type helmet display driving circuit based on FPGA

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 [0001] The invention relates to a helmet display driving circuit, in particular to an FPGA-based LCD type helmet display driving circuit. Background technique [0002] With the development of science and technology, there are more and more types of Head Mounted Displays (HMDs). The early CRT helmet-mounted display has a series of problems such as weight and power supply voltage, and will be replaced by other types of displays. Among them, the LCD screen has the characteristics of high contrast, low power consumption, small size and light weight, and is very suitable for the application of the helmet-mounted display. . [0003] Since the LCD screen is a non-active light-emitting display device, it needs an external backlight to emit light in order to present the information displayed on the LCD. In addition, the helmet-mounted display is required to work in a wide temperature range (-45 ° C ~ -60 ° C), but the liquid crystal is easy to freeze at low temperat...

AI Technical Summary

Problems solved by technology

This design scheme has the following problems: (1) There are two main control chips in the entire system, resulting in an increase in power consumption and board area; (2) The implementation of the controller is to execute statements one by one. There will be a problem of program running away; (3) LCDs used in helmet-mounted displays are mostly imported devices, and foreign countries are more sensitive to their related technologies, blocking the technology, and it is difficult to find complete information on dedicated ASICs, which makes the design more difficult. Yamato cycle lengthening

(4) Due to the improvement of the design and the change of the international form, there are problems in the purchase of dedicated ASIC chips

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