**LED display working principle analysis * *

LED display, as a display device widely used in commercial advertising, cultural entertainment, sports events and other fields, its working principle is based on the characteristics of light-emitting diodes (LED). This article will analyze the working principle of LED display in detail, and discuss its important components and application scenarios.

Basic composition of 1. LED display

The basic composition of an LED display includes a light emitting material (LED), a driving circuit, a control circuit, and a frame structure. Each LED as the basic element of the display (pixel), through the control circuit and drive circuit to control its bright and dark or its degree, so as to achieve a variety of information display. LED displays are usually composed of multiple small LED module panels, forming a grid-like structure, and each LED represents a pixel.

The working principle of 2. LED

The LED, that is, a light emitting diode, is a diode made of a compound of gallium (Ga) with arsenic (As), phosphorus (P), nitrogen (N), indium (In). When electrons and holes recombine, they can radiate visible light, so they can be used to make light-emitting diodes. The gallium arsenide phosphide diode emits red light, the gallium phosphide diode emits green light, the silicon carbide diode emits yellow light, and the indium gallium nitride diode emits blue light. In the LED display, red, green, and blue LEDs of three different colors are combined together. Through different brightness and color combinations, colorful images can be displayed.

The working principle of 3. LED display

The working principle of the LED display is to use the characteristics of light-emitting diodes to form an array of LED devices through a certain control method to form a display screen. By controlling the brightness and color of each LED, the desired image or text can be created when specific content is to be displayed. Controlling the brightness and color of the LEDs can be done by digital signals. The control system of the display screen will send the corresponding LED according to the input digital signal to control its brightness and color.

In order to achieve high brightness and clear display effect, LED display usually adopts PWM (pulse width modulation) technology. PWM technology controls the change of display brightness by constantly switching the LED's on and off state. This method not only makes the display effect more delicate, but also effectively prolongs the service life of the LED.

Control System of 4. LED Display

The control system of the LED display includes specific control methods for receiving and storing display data, data processing and distribution, and sending data to the LED display. Among them, the LED display information processing system is mainly responsible for processing the original data, such as decoding, format conversion, image processing, etc., to ensure that the data can be correctly displayed on the LED display.

The driving circuit of LED display is generally controlled by single chip microcomputer, among which the 51 series is the most common. The contents of the display are often stored in the external data memory of the microcontroller in the form of a font. The control process of the single-chip microcomputer to the LED display screen is to read first and then write. Through the way of line scanning and column scanning, the LED is lit line by line to form a complete image display.

Features of 5. LED display

LED displays have many advantages, including high brightness, long life, large viewing angle, energy saving and environmental protection. Its high brightness, can be used outdoors all-weather, but also can be used indoors. LED has a long service life, generally more than 100000 hours, energy saving and environmental protection, low voltage power supply, low power consumption and no pollution.

In addition, the LED display also has the characteristics of flexible size, high reliability, real-time and high efficiency. Its size can be designed according to needs, from small to less than one square meter to hundreds or thousands of square meters. The LED display can work under harsh environmental conditions, such as high temperature, low temperature, humidity and other environments, and can display various information in real time, such as news, advertisements, notifications, etc.

Application Scenarios of 6. LED Display

LED displays have a wide range of applications. In the field of commercial advertising, LED display can be used to broadcast advertising, promotional information, etc., with high brightness, high definition, bright colors and other characteristics, can attract the attention of a large number of viewers, improve the effectiveness of publicity. In the field of culture and entertainment, LED displays can be used in stage backgrounds, concerts, concerts and other cultural and entertainment activities to create a unique atmosphere and visual effects, and enhance the audience's viewing experience. In sports events, LED display can be used in stadiums and gymnasium, real-time display of game information, timing scoring, wonderful playback and other functions, to provide the audience with a more convenient and accurate viewing experience.

In summary, the working principle of the LED display is based on the characteristics of the light-emitting diode. Through the control circuit and the driving circuit, the LED devices are formed into an array to form a display screen. Its advantages of high brightness, long life, large viewing angle, energy saving and environmental protection have made LED displays widely used in commercial advertising, cultural entertainment, sports events and other fields.