Brief introduction: the development and quality evaluation of LED display screen

LED display as a new display media, along with the rapid development of large-scale integrated circuit and computer technology, has been rapid development, and it shows that the traditional media -- the colorful neon lights, television wall, four-color magnetic flap compared to its high brightness, dynamic image display and the fault of low power consumption, long service life, ample display content and display, and high ratio of performance to price advantage, as a new generation of display media, has been widely used in all walks of life. In particular, the grayscale display with its modern attitude for corporate image promotion and public information display, has become an irreplaceable display media.

LED display development

Throughout the development process of LED display, with the development of modern science and technology are closely related, in 1982 the first domestic LED display built in NanJing Railway Station, because of the LED material limit, the brightness of only about 8mcd, and the control and drive circuit is not mature enough, the display effect is poor, the failure rate is very high. From the beginning of 1992, with electronic components to improve performance, the development of large scale integrated circuit and computer technology, the reliability and brightness of LED devices increases, costs continue to decline, especially in the financial securities industry market demand growth, the domestic LED display screen to enter the stage of rapid development, the multi LED video display gray, compared with the TV wall, rear projection screen, LED display with high brightness, strong contrast, all-weather operation and other advantages, has been widely used, has now become the media, financial securities, the necessary equipment of terminal stations, stadiums etc.. Especially indoor full color (indoor three color screen) development direction in the future for a period of time in the LED screen has the panchromatic holographic, small particles, vivid color and advantages, with the light emitting devices become more and more delicate and substantial price cuts, indoor full color will be quite in favor of the market, to make up for the lack of color projection and other equipment.

At the beginning of 80s, with the development of computer, CGA display mode appeared, it has 320*200 resolution of four color display mode has experienced CGA, EGA, SEGA, VGA, SVGA in the short 10 years, to the development of super high resolution display accuracy from 320*200 to 1600*1250, from four to 32 colors bit color, scanning frequency from 15.7K to 150K. The operating principle of the monitor signal received from the host is reduced to the form of light is displayed, along with the development of people needs a big screen of the device, and a projector, but its brightness can not be used in natural light, so there is a LED display (screen), it has the characteristics of large angle, high brightness, color gorgeous. The application of LED display has been very extensive in stadiums, large screen display system can live games and game score, time, replay etc.; in the transportation industry, can display the road operation; in the financial industry, and can display real-time financial information, such as stock, exchange rate and interest rate; in the commercial telecommunications system. You can display a notification message, advertising and so on to customers. According to the survey, the information received by the 2/3 information is obtained through the eyes. Display technology is used in industry, military, medical units, public security system and the aerospace industry in the national economy, social life and the military field, and plays an important role in display technology has become an indispensable technology in modern society. Quality evaluation technology of LED display screen

Out of control point (not bright lights or points) indoor LED display control point is not greater than 3/10000, the outdoor LED screen out of control point should not be greater than 3/1000, and for the discrete strong;

Consistency consistency of the LED screen is better, the whole screen brightness to be balanced, no obvious color;

Security, no security risks of leakage current, leakage current shall not exceed 3.5mA (RMS); resistance strength, LED 50Hz, 1500V display (RMS) test voltage Lmin should not occur at the same time insulation breakdown; LED display in the fuse and switch power supply should be a warning sign;

Appearance, LED display frame no obvious scratch. Outdoor LED display pixel tube installation should be consistent, no loosening and shell rupture;

Structure, LED display part can be made of steel, aluminum, wood and other materials, requires a solid structure, beautiful.