Local Dimming PWM Compensation for Moving-Object Flicker

The patent implements dynamic PWM table generation based on detected object movement speed. The system adjusts the PWM table in real-time according to the speed of moving objects, creating a dynamic compensation mechanism that adapts to changing scene conditions. This resolves the contradiction by making the dimming control flexible rather than static, allowing brightness uniformity to be maintained during object movement while preserving contrast improvement in dark scenes.

The patent employs feedback by detecting object movement and using this information to generate compensated PWM tables. The system continuously monitors for moving objects and adjusts the PWM values accordingly, creating a closed-loop control system. This feedback mechanism allows the system to respond to brightness uniformity issues as they arise, resolving the contradiction between contrast enhancement and brightness stability during motion.

The patent dynamically adjusts PWM values based on detected object movement speed. When objects are detected moving across the screen, the system modifies the PWM table to compensate for the apparent brightness changes caused by motion. This dynamic adjustment prevents flickering artifacts while maintaining the contrast improvement benefits of local dimming in dark scenes.

The patent applies preliminary anti-action by pre-calculating and applying compensation values to the PWM table before the flickering effect occurs. The system detects moving objects and proactively adjusts the PWM values to counteract the potential brightness variations that would cause flickering. This preventive approach eliminates flickering while preserving contrast ratio improvement.

The patent segments the processing by dividing the screen into zones and detecting objects within specific regions. Rather than processing the entire frame uniformly, the system identifies moving objects in specific zones and applies compensation only where needed. This segmentation approach maintains brightness uniformity for moving objects while reducing overall processing complexity by focusing computational resources on affected areas only.

The patent implements self-service by using the existing PWM table structure and overlaying compensation values directly onto it. The system leverages the current PWM framework and adds motion compensation functionality without requiring a complete redesign of the processing architecture. This approach improves brightness uniformity while minimizing the increase in processing complexity by building upon existing infrastructure.