LED classification and parameters.P3.91 outdoor /indoorled screen modules

　　(1) According to the character height: the character height of the stroke display is at least 1mm (the character height of the monolithic integrated multi bit Nixie tube is generally 2~3mm). Other types of stroke displays can reach up to 12.7mm (0.5 inches) or even hundreds of millimeters.

　　(2) There are several types of colors, including red, orange, yellow, and green.

　　(3) According to structure, there are reflective cover type, single seven segment type, and single integrated type.

　　(4) There are two types of electrode connection methods for each luminescent segment: common anode and common cathode.

　　Due to the fact that LED displays are based on LEDs, their optical, electrical characteristics, and limit parameter meanings are mostly the same as those of light-emitting diodes. However, due to the inclusion of multiple light-emitting diodes in LED displays, the following special parameters are required:

　　1. Luminous intensity ratio

　　Since the forward current of each section of Nixie tube is different when the driving voltage is the same, the luminous intensity of each section is different. The ratio of the maximum to minimum luminous intensity values of all segments is the luminous intensity ratio. The ratio can be between 1.5 and 2.3, and the maximum cannot exceed 2.5.

　　2. Pulse forward current

　　If the typical forward DC working current of each segment of the stroke display is IF, the forward current can be much greater than IF under pulse conditions. The smaller the pulse duty cycle, the greater the forward current of the pulse.

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