LED (light-emitting diode) display system based on power network

Abstract

An LED display system based on a power network is disclosed, relating to an LED display system connected to the same power network wire and sharing one power switch, particularly to linear display devices such as LED guardrail tubes and an LED asynchronous display screen. The power switch of the LED display system is a power zero-crossing switch provided with a CPU (central processing unit) counting circuit for counting cycle characteristic signals, wherein the power switch matches with conventional time-base circuits such as a crystal oscillator to generate a mixed time-base signal, for keeping the synchronization of system operation. The LED display system is divided into a plurality of same standard modules to facilitate production while being used for the LED asynchronous display screen, and each module has own serial number; the LED display system has no need to utilize a controller and can compile a complex application program while being used for the linear display devices suchas LED guardrail tubes. Each guardrail tube independently works as well as can realize the cross display of various complex display methods and realize full-colour and grey-scale control.

Description

(1) Technical field: [0001] The invention relates to an LED display system which is connected to the same power network line and shares a power switch, especially the application in linear display devices such as LED barrier tubes and LED display screens. (two) background technology: [0002] LED is a semiconductor that can convert electrical energy into visible light. With the advancement of semiconductor technology, LED light sources have been widely used, especially LED lighting and advertising have become quite popular. LED lighting and advertising products on the existing market, such as guardrail tubes, LED display screens, etc., all need controllers and communication lines, and the main controller needs to generate synchronization signals to coordinate their orderly work. The quality cannot be kept in sync for a long time. At present, the guardrail tube internal control programming IC chip that appears in the LED lighting market is a low-end high-quality product usin...

AI Technical Summary

Problems solved by technology

LED lighting and advertising products on the existing market, such as guardrail tubes, LED display screens, etc., all need controllers and communication lines, and the main controller needs to generate synchronization signals to coordinate their orderly work. The quality cannot be kept in sync for a long time

At present, the guardrail tube internal control programming IC chip that appears in the LED lighting market is a low-end high-quality product using a single-chip microcomputer of a certain brand. The functional IC chip formed by special programming enters the market. It can only write simple programs of hundreds of bytes. Sometimes there are many restrictions, resulting in poor time accuracy and poor stability, and you cannot choose a microcontroller or a single-chip microcomputer at will, and you cannot program freely or write complex programs. Due to the slow start of the crystal oscillator, you can only use RC, etc., which is a big problem. It limits its scope of application and reduces its use effect, so a large number of high-end products of guardrail tubes, especially LED displays, cannot be used

In addition, the guardrail tube using the communication line requires a controller and a communication line because the main controller needs to generate a synchronous scanning control signal, but a large number of long communication lines cause signal interference and signal fading, so each controller must be strictly limited. The number and length of the guardrail pipes connected

On the other hand, due to the large and complex structure of the program and hardware, the LED display must use a high-speed, high-performance microprocessor and a specially designed controller, which limits the standardized production of LED display software and hardware.

The existing market is one-to-one according to the size provided by the user and then assembled and produced. Due to the discrete nature of the product, many aspects such as product design and production technical standards are restricted, which affects the quality of LED display screens.

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