LED display screen is an electronic display that combines advanced technologies such as computer technology, information processing technology, electronic technology, optics, and colorimetry. LED display screens are divided into monochrome screens, dual color screens, and full-color LED display screens. The so-called monochrome screen, as the name suggests, is composed of a single LED of a certain color. A display screen with red and green LEDs as one pixel is called a dual color screen or color screen. A display screen that combines red, ירוק, and blue LEDs as one pixel is called a tri color screen or full-color LED display screen.
With the continuous increase in brightness of green chips and the continuous decrease in prices, full-color LED displays are being popularized and promoted at an unprecedented speed.
Full color LED displays are divided into indoor full-color LED displays and outdoor full-color LED displays. There are generally two ways to drive LEDs, one is to change the current of the LED. באופן כללי, it is best to set the operating current of LED below 20mA to ensure the anti-aging performance of LED. Another approach is to utilize the visual inertia of the human eye and use pulse modulation to achieve grayscale control. The perception of average pixel brightness by humans can depend on its decay/extinction (מחזור חובה), which periodically changes the duty cycle. As long as this cycle is short enough, the human eye cannot sense its decay/extinction.
The pitch of a full-color indoor LED display screen is 2mm-12mm, and indoor LED displays with a pitch of 2mm-8mm generally use the TOP type surface mount method or the currently developed sub surface mount method. The pitch of outdoor LED display screens is 10mm-40mm, and at the current level of green LED brightness, a pitch of 20mm is the most mainstream product among them.
After more than a decade of development, domestic LED display companies have made rapid progress. למרות זאת, compared with developed countries such as Europe, America, and Japan, there is still a certain gap, especially in the packaging technology and design level of the most important display device LED, which still has shortcomings.
