Structure Composition and Characteristics of LED Electronic Display Screen

Now generally, the LED display screen that displays graphics or text is called graphic screen. In fact, the LED graphic display screen does not have a recognized and strict definition. The so-called graphics here refers to any graphics composed of monochrome dot matrix lines with fixed brightness, in which the LED dot matrix light-emitting devices either light or turn off, that is, there are only two states.LED electronic display screen is composed of special computer equipment, display screen, video input port and system software.Computer and special equipment: computer and special equipment directly determine the function of the system, and different types can be selected according to different requirements of users for the system.

Structure Composition and Characteristics of LED Electronic Display Screen 1

Display screen: the control circuit of the display screen receives the display signal from the computer, drives the led to emit light to produce a picture, and outputs sound by adding power amplifier and speaker.Video input port: provide video input port. The signal source can be video recorder, DVD player, camera, etc., and support NTSC, pal and s_ Video and other formats.System software: provide special software for LED playback, PowerPoint or es98 video playback software.

LED display screen mainly has the following characteristics:1. High brightness: the brightness of outdoor LED display screen is greater than 8000mcd / , which is the only large-scale display terminal that can be used outdoors all day; The brightness of indoor LED display screen is greater than 2000mcd / .2. Long service life: the service life of LED is more than 100000 hours (ten years). This parameter generally refers to the design service life, even if the brightness is dark.

3. Large viewing angle: the indoor viewing angle can be greater than 160 degrees and the outdoor viewing angle can be greater than 120 degrees. The size of the viewing angle depends on the shape of the LED.4. The screen area can be large or small, ranging from less than one square meter to hundreds or thousands of square meters; 5. Easy to interface with computer and rich supporting software.Recommended reading: http://www.elecfans.com/d/879147.html

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Anti Aging Knowledge of LED Electronic Display Screen
LED display advertising media also has the advertising characteristics of high effective arrival rate. Compared with TV, newspaper and other media delivery forms, the price of LED display is relatively low. These unique values make the full-color LED advertising screen media naturally become the upstart of outdoor media.Different from the traditional outdoor media, the full-color LED display is not just a simple outdoor media. It also has the characteristics and advantages of TV and other media. It has a larger creative space and a broader three-dimensional space for space-time interaction and communication with consumers. It can meet the personalized needs and has the communication concept of the digital age. It is a unique screen form.We often have such problems when applying LED display. LED display works normally at the beginning of the product, but after it is lit for a period of time, there will be dark light, flashing, failure, intermittent lighting and other phenomena, which will bring serious damage to the product. The reasons for this phenomenon are as follows:First, when applying products, there are problems in the welding process, such as too high welding temperature, too long welding time, failure to do anti-static work, etc. more than 95% of these problems are caused by the packaging process.Second, led quality or production process. Prevention methods include:1. Control the welding process.2. Aging test of products: aging is an important guarantee for the reliability of electronic products and the last essential step in product production. LED products can improve efficiency after aging and contribute to the stability of efficiency in later use. The aging test of LED display screen is a very important link in product quality control, but it is often ignored in many times, so it is impossible to carry out correct and effective aging.Led aging test is a countermeasure taken according to the characteristics of product failure rate curve, that is, bathtub curve, so as to improve the reliability of products, but this method is not necessary. After all, aging test is at the cost of sacrificing the service life of a single LED product.Led aging methods include constant current aging and constant voltage aging. Constant current source means that the current is constant at any time. If there is a problem of frequency, it is not constant current. That's AC or pulsating current. AC or pulsating current source can be designed with constant RMS, but this power supply can not be called constant current source.Constant current aging is the most scientific led aging method, which is most in line with the working characteristics of LED current; Overcurrent impact aging is also the latest aging method adopted by LED display manufacturers. Such aging is carried out by using a constant current source with adjustable frequency and current, so as to judge the quality and expected life of LED in a short time, and pick out many hidden dangers that cannot be picked out by conventional aging.
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