LED is a light-emitting diode in English LightEmittingDiode abbreviation. It has the advantages of high brightness, large visual distance, clear image, bright colors, good stability, low power consumption, high luminous efficiency, long life and so on.
Second, the types of LED display
1, according to the display color can be divided into single-color (red or green), double-color (red, green), three-color (red, green, blue).
2, according to the display performance can be divided into graphic screen, synchronous screen, asynchronous screen, ticker display (including securities screen, interest rate screen, factory signboards, safety signs, etc.)
3, according to the light-emitting materials:
①Module (for indoor screen): according to the light-emitting point (i.e., light-emitting diode) diameter can be divided into Ф3.0mm, Ф3.75mm, Ф4.8mm, Ф5.0mm and so on. 5.0mm, etc.
② module and pixel tube (for outdoor screens): according to the point pitch can be divided into PH8mm, PH10mm, PH12mm, PH16mm, PH20mm, etc.
③ digital tube (for ticker display): according to the point pitch can be divided into 1.2 inches, 1.5 inches, 1.8 inches, 2.3 inches, 3.0 inches, 4.0 inches and so on.
4, according to the use of environmental points: can be divided into indoor screen, outdoor screen and semi-outdoor screen.
Three, the role and application of LED display
1, LED display with display text, images, animation, quotes and television, video and so on. With a variety of editing and playback functions.
2, LED display is widely used in finance, commerce, taxation, electric power, transportation, telecommunications, medical, health system and government agencies, stadium tube, industrial and mining enterprises and other industries.
Four, the composition of the LED display
In 1923, Rousseff (Lossen.o.w) in the study of semiconductor SIC when there are impurities in the P-N junction of light emission, the study of light-emitting diodes (LED: LightEmittingDiode), has been unappreciated. With the rapid development of the electronics industry, in the 1960s, the display technology has been rapidly developed, people have studied the PDP laser display plasma display board, LCD liquid crystal display, light-emitting diode LED, electrochromic display ECD, electrophoretic display EPID, and many other technologies. Due to the semiconductor production and processing technology gradually mature and perfect, light-emitting diode has been increasingly dominant in the solid state display. LED is widely valued and rapid development, because it has its own activities, many advantages. For example: high brightness, low operating voltage, low power consumption, easy to integrate, drive simple, long life, impact resistance and stable performance, its development prospects are extremely broad. Currently moving towards higher brightness, higher weather resistance and luminous density, luminous uniformity, full-color development.
In the early 80's, with the development of computers, CGA display was introduced, it has a resolution of 320 × 200 four colors, in just 10 years the display has experienced CGA, EGA, SEGA, VGA, SVGA, to the development of ultra-high resolution, the display accuracy of the development of 1600 × 1250 from 320 × 200, by four colors to 32-bit true color, scanning frequency from 15.7KHZ development to 150KHZ. the working principle of the display is to receive the signal from the host to reduce to the form of light to display, with the development of people need a large screen equipment, so there is a projection apparatus, but its brightness can not be used in natural light, so the emergence of the LED display (screen), which has a large viewing angle, high brightness, bright colorful The application of LED display has been very wide, in the stadium, the large screen display system can be the game live and the game score, time, playback, etc.; in the transportation industry, you can display the road operation; in the financial industry, you can, real-time display of financial information, such as stocks, exchange rates, interest rates, etc.; in the commercial postal and telecommunication system, you can show the majority of customers notices, messages, advertisements and so on. According to the survey, people receive information 2/3 of the information is obtained through the eyes. Display technology is also used in industrial production, military, medical units, public security systems and even astronautics and other national economy, social life and military fields, and plays an important role, display technology has become an indispensable technology of modern human social life.