An isolated serial liquid crystal driving system and method based on current direction

Abstract

The invention relates to an isolated serial liquid crystal drive system based on current direction, which comprises a main control microprocessor, a main control microprocessor isolation module, a current signal drive module, a drive cable, a serial liquid crystal display isolation module and Serial liquid crystal display, control the current direction is the current signal drive module converts the high and low levels in the main control microprocessor isolation module in the form of current direction, through the transmission of the drive cable, and then the serial liquid crystal display isolation module Converted to the corresponding current direction, the drive cable in the middle completely separates the isolation conversion circuit on the side of the main control microprocessor and the isolation conversion circuit on the side of the serial liquid crystal display, and the drive cable does not generate electricity with any side of the circuit. The above connection makes the installation position between the main control microprocessor and the serial liquid crystal display no longer limited by the digital circuit.

Description

technical field [0001] The present invention relates to a liquid crystal driving system and method, in particular to an isolated serial liquid crystal driving system and method based on current direction. Background technique [0002] With the popularization and development of science and technology, the traditional relay-type protective devices in the past have gradually been eliminated, and the intelligent microcomputer comprehensive protection device has emerged as the times require. This type of intelligent product relies on the microprocessor as the core. The digital circuit with a main frequency above 100MHz adopts a variety of dot-matrix LCD screens for user convenience. The birth of this type of product has improved the intelligence level of the coal mine power supply system, and at the same time greatly improved the reliability of power supply. The prospects are very broad. However, the structure of the current intelligent comprehensive protection device is relativ...

AI Technical Summary

Problems solved by technology

However, at present, the structure of the intelligent comprehensive protection device is relatively simple, because it is limited by the digital circuit. In order to achieve the best display results, the main frequency of the processor is faster than 100MHz, and the LCD screen uses a parallel bus. The biggest problem is that the length of the bus needs to be limited. The requirement from electronic circuits is that the bus should be as short as possible in order to achieve high reliability and stability. The length of the bus depends on the product. Whether the electromagnetic compatibility test of the whole machine can be satisfied, the main reason is that the high-frequency digital signal is very easy to be disturbed on the long-distance transmission line, and the level on the driving data line that controls the LCD becomes an uncontrollable level model, affecting the LCD The normal display of the monitor; under such a technical background, the positions of the main board and the liquid crystal of the intelligent comprehensive protection device are relatively restricted

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