Micro LED Display Panel PWM Brightness Control

The patent employs pulse width modulation (PWM) to control the brightness of micro LEDs by periodically switching the driving current on and off. The duty cycle of the PWM signal determines the average brightness, allowing precise control without requiring large continuous currents. This periodic action enables brightness adjustment while maintaining lower peak current levels, resolving the contradiction between brightness control and excessive driving current.

The patent changes the control parameter from direct current magnitude adjustment to pulse width modulation duty cycle adjustment. By varying the duty cycle of PWM signals rather than adjusting current magnitude directly, the system achieves fine-grained brightness control while keeping the peak current within safe limits. This parameter transformation resolves the issue of excessive driving current while maintaining effective brightness control.

Instead of using multiple voltage levels for gray scale control, the patent uses PWM with a fixed voltage and variable duty cycle. This periodic switching approach simplifies the voltage setting complexity by requiring only a single voltage level, while gray scale is achieved through temporal modulation. The PWM technique transforms a complex multi-voltage control problem into a simpler single-voltage temporal control problem.

The patent replaces the mechanical/electrical approach of adjusting voltage levels with an electronic timing-based PWM approach. Rather than physically or electrically switching between multiple voltage levels (complex), the system uses a single voltage level with electronic timing control to achieve gray scale. This substitution of control mechanism reduces device complexity while maintaining effective gray scale control.