Basic parameter selection of outdoor LED display

　　1. Types

　　According to the color of the LED adopted, the outdoor LED display can be divided into single -base, dual -base color and full -color screen. The single -based color LED display can be used as a text display. Each pixel is used in a monochrome LED, most of which uses red; the dual -based LED display can be used as a graphic display. Each pixel is composed of two types of LED tubes. The real red, green and yellow color display; the full -color LED display can be used as a video display. Each pixel is composed of three types of LED tubes of red and green, and the display color is delicate.

　　2. Point spacing

　　When selecting the outdoor LED display, the point spacing of the display screen should be selected according to the distance between the audience. The outdoor LED display generally is generally divided into P4, P6, P8, P10, P16, and so on. Generally, the simplified formula "Best Visual distance = point spacing/(0.3~0.8)" can be estimated.

　　3. Gray

　　Gray degree is an important indicator for measuring the effect of the outdoor LED display display. The gray degree is determined by the number of modulus conversion bits when other supporting hardware support. The mainstream is 8, 10, and 16 -bit. Corresponding to 256 kinds of brightness changes, that is, 256 grayscale, a total of 256 × 256 × 256 = 16777216 color changes, which are usually referred to as 16m color; 10 -bit model conversion corresponds to 1024 brightness changes, that is, level 1024 grayscale There are 1024 × 1024 × 1024 = 1073741824 color changes, which are usually said to 1.07 billion colors. The higher the gray level, the better the display effect.

　　4. Driving method

　　The driving method of outdoor LED display should be determined according to the expected display effect and budget. The LED display generally uses a constant current driver. The driving method is divided into static scanning and dynamic scanning. In simple terms, static scanning is a pipe foot of the driving chip to control a LED. Control several LED lights. Static scanning display effects are relatively good, less light losses, but the cost is relatively high; dynamic scanning display effect is relatively poor, and the light loss is large, but the cost can be reduced. Common dynamic scanning is 1/2, 1/4, 1/8, and 1/16.

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