LED display screen is an electronic display that combines high-tech technologies such as computer technology, information processing technology, electronic technology, optics and colorimetry. Generally speaking, LED display screen is divided into monochrome screen, dual color screen and full color screen. . The so-called monochrome screen, as the name suggests, the display is composed of a single LED of a certain color. The display screen that uses the red and green LEDs as a single element is called a two-color screen or a color screen. The display screens of red, green and blue LEDs together as a picture element are called three-color screen or full-color screen. With the continuous increase in the brightness of green chips, full color screens are being popularized and promoted at an unprecedented speed. In particular, the success of Beijing's Olympic bid, it proposed the "green Olympics" call, making the market prospect of LED full color screen more attractive.
LED full color screen is divided into indoor screen (Indoor) and outdoor screen (Outdoor), we first introduce the common terms of several full color screens. Point (Pixel): short for the element point, generally consists of three colors of R / G / B LED. According to the different composition methods, it is divided into 1R/1G/1B, 2R/1G/1B, 2R/2G/1B and other different combinations. It is the basic imaging unit of full color screen.
Pitch: The distance between the center points of each element of the display screen, usually expressed in mm, which determines the number of elements in a full color screen. Gray Scale: The fineness of the brightness adjustment of the display screen is called the gray level of the display screen. Generally speaking, the higher the gray level, the richer the display color. There are two ways to change the color of the LED. One is to change the current of the LED. In general, the operating current of the LED is preferably set below 20 mA to ensure the attenuation resistance of the LED. The other is to use the visual inertia of the human eye to achieve gray scale control with pulse modulation. The person's perception of the average brightness of the primitive may depend on its decay/deactivation (duty cycle), ie, periodically changing the duty cycle, as long as the period is short enough, the human eye will not feel its decay/deactivation. Generally speaking, the pitch of the indoor screen is 2-12 mm, and the indoor screen of 2-8 mm generally uses the TOP type patch method or the sub-surface sticking method developed now. The outdoor screen has a Pitch of 14-26mm. The current green LED brightness level and Pitch 20mm display screen are the most mainstream products. Domestic display screen manufacturers, after more than ten years of development, progress is very fast, but compared with developed countries such as Europe, America and Japan, there is still a certain gap, especially the packaging technology and design level of the most important display device LED. There are still many shortcomings. Shenzhen Lehman Optoelectronics Technology Co., Ltd., as a member of the LED Display Branch of China Optical Optoelectronics Industry Association, has long been focusing on the light distribution research of LEDs for display screens. The company has brought together a group of elites who have been committed to LED research for a long time and invested in a large number of equipment. And human resources to conduct in-depth research on foreign leading products, and combined with their own characteristics, summed up a set of LED light distribution, color solution, and now share with you to jointly improve the process and light distribution level of each LED packaging factory, Do our part for the technical improvement of China's LED full color display screen. The LED light distribution method is a complete set of technologies, including K-factor management of the production chip, control of the packaging process, white balance, and optical design of the LED Lens. It is stated separately as follows:
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