LED Display Driver Circuitry for Uniform Low Brightness

The patent applies parameter changes by dynamically adjusting the pulse width distribution parameters in Scrambled PWM based on grayscale value ranges. Different segmentation strategies are used for different brightness levels, with specific compensation values applied to low grayscale values to ensure minimum pulse width thresholds are met, thereby maintaining brightness uniformity across the full grayscale range while preserving high refresh rates.

The patent applies local quality by implementing selective pulse width extension only for specific segments and grayscale ranges where needed. Instead of uniformly extending all pulses, the compensation mechanism targets only the low grayscale values that cause visible flicker and non-uniformity, leaving higher grayscale values unchanged. This localized approach maintains brightness uniformity where problematic while minimizing unnecessary power consumption.

The patent applies self-service by implementing a self-compensating Scrambled PWM system that automatically adjusts pulse width distribution based on the inherent characteristics of the LED and display timing. The compensation values and segmentation parameters are pre-calculated and stored, allowing the system to self-regulate brightness uniformity without requiring external power sources or complex additional circuitry. The system uses its existing resources to solve its own brightness uniformity problem.