Intelligent Signal Display Control System Based on 96-Channel Matrix Driver

XU Tingting; BU Xueqiu

doi:10.3969/j.issn.1004-440X.2024.04.019

Abstract：With the continuous intelligent upgrading of automobiles and their accessories,car lights with dynamic effects have emerged and developed rapidly.However,the vast majority of them are presented in a flowing water manner,and the animation hierarchy is not rich enough.This article will introduce an intelligent interactive light control system based on a 96-channel matrix driver.Each LED independently undertakes the display function,and thousands of LEDs are arranged and distributed in an orderly manner in the car lighting panel.According to different scenes,the lighting panel presents interesting patterns and text,or according to the users'needs,conducts friendly interaction and dialogue with fellow drivers and pedestrians.In this system,the LED control manager uses an automotive-grade matrix module with 96 channels per chip.Using its programmable multiplexing feature,each LED is driven by time-sharing PWM.The LED can be lit only when the PWM waveform at the positive pole of the LED is at a high level and the PWM waveform at the negative pole of the LED is at a low level.When the positive PWM waveform of the LED and the negative PWM waveform are at the same level,the LED will not be lit up.Changing the duty cycle of the PWM can change the brightness of the LED.By designing a circuit based on this principle,the on/off and brightness of each LED is controlled.The small volume of the 48-pin TQFN package can be easily mounted on LED panels,and can be used with CAN transceivers to achieve off-board design and long-distance communication.The driving circuit in this system uses a low-cost step-down module,and the MCU completes intelligent interactive lighting playback through two communication methods:SPI and CAN bus.