According to the application site classification, the LED display screen can be divided into indoor and outdoor according to the application place. The indoor screen is mainly used indoors. In the production process, the light-emitting die is first made into a dot matrix module (or digital tube). Then, the module is spliced ​​into a certain size display unit board, and according to the user's request, the display unit board is used as a basic unit to be spliced ​​into a size required by the user. According to the size of the pixel, the indoor screen is divided into Ф2, Ф3, Ф3.75, Ф4.8, Ф5, Ф8, Ф10, and the like. The outdoor screen is mainly used for outdoor use. In the manufacturing process, the light-emitting die is first packaged into a single light-emitting diode, which is called a single lamp. The single lamp used for making the outdoor screen generally adopts a reflective cup with a collecting effect to improve Brightness; then, a plurality of LED single lamps are packaged into a single pixel tube or a pixel module, and a pixel tube or a pixel module is used to form a dot matrix display unit box, and a display unit box is used according to user needs and display application places. The body is the size required for the basic unit composition. The cabinet should be sealed in design to achieve the purpose of waterproofing and anti-fog, so that it can adapt to the outdoor environment. According to the size of the pixel, the outdoor screen is divided into Ф11, Ф14, Ф16, Ф19, Ф21, Ф26, Ф36 and other specifications. According to the primary color classification: According to the color of the LED used, the LED display can be divided into single primary color, double primary color, and full color. Single primary color: Each pixel has only one color, and most of them use red. Because red has higher luminous efficiency, it can obtain higher brightness. It can also use green or mixed color, that is, part is red and part is green. Part of it is in yellow. Double primary color: Each pixel has two primary colors, red and green, which can be superimposed with yellow. In the case of gamma control, up to 65,535 colors can be combined by different red and green gradations. Full color is also called three primary colors. Each pixel has three primary colors of red, green and blue. In the case of gray control, the color of different colors of red, green and blue can be used to restore the color of nature, and 16777216 is combined. Kind of color.
In fact, in recent years, the rapid advancement of the optoelectronic industry has been widely valued by the society, and the display products and technologies as the visual communication media for human-machine information have been rapidly developed. With the formation of product standard systems and the implementation of series standards, the LED display industry is developing in a healthy and orderly direction. LED display is currently a lucrative market. In addition to large stadiums, it is also widely used in highway toll stations, highway signage, airport flight information display, terminals, ports, railway stations, tunnels, game consoles, and outdoor city squares. Billboards, government offices, parking lots, etc., are used to display some dynamic information in real time.
For a long time, due to manufacturing processes and other reasons, the characteristics of LEDs are very different. When the display modules made of these LEDs are integrated into the LED display screen, if these differences are not adequately compensated, the LED electronic display will be caused. The difference in brightness and color of the screen is clearly visible; at the same time, after the LED display is installed for a period of time, the brightness and chromaticity of the LED will change with time, but the degree of attenuation of each LED is different, which will lead to LED The visual quality of the display has decreased; in addition, the replacement of the damaged LED module during the use of the LED screen causes the new module to be mismatched with the entire screen, which also reduces the visual quality of the LED display.
The number of LED display screens is relatively large. There are hundreds of small and medium-sized LED display companies in Shenzhen, and their technology is relatively mature. The structure and principle of the display screens manufactured by various enterprises are basically similar. How to improve the technical performance of the display screen and reduce the cost is the key to competition among enterprises. Now, the prices of LED displays sold on the market are basically the same. However, the quality of displays produced by different companies is different. The reasons are various, including the quality, brightness, brightness uniformity, packaging, etc. of LED display modules. The difference in technology, the way data is transmitted, the difference in anti-interference ability, and the difference in control circuits, and the correction of LED displays can effectively help companies solve these problems. At present, the number of enterprises using LED display correction technology is increasing. As the demand for high-quality display screens is increasing, the LED display point-by-point correction technology will be vigorously promoted and eventually become the key technology to ensure quality. one.
However, due to the collapse of the collapse of the previous period, the LED display industry has been pushed to the crater. The market where profits fell to a low point once made everyone deeply worried about the future development of the industry. Zhang Hanliang, deputy general manager of Shenzhen Kelunte Co., Ltd. summarized the development of LED display industry with five processes: stationary period - development period - peak period low period - maturity period. He said that before 2005, the LED display was slower due to the fact that the full-color series was not very mature. In 2006, it began to mature, and in the three years from 2006 to 2008, LED display profits reached a peak.
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