3nv04p is the driver chip.
LED driver chip can be divided into general purpose chip and special chip, under the premise of saturation conduction, its brightness changes with the current size.
General purpose chips are generally used for low-end LED display products, such as indoor single and two-color screens. The most commonly used general-purpose chip is the 74HC595, which has an 8-bit latch, serial-and-shift register, and three-state output. Each channel can output a maximum of 35 mA of non-constant current.