Backlight Control Pulse Segmentation for LCD Flicker Reduction

The patent segments the single high pulse section into multiple high pulse sections (first high pulse section, second high pulse section, third high pulse section) with different duty cycles. This segmentation allows the backlight to be turned on and off multiple times within one dimming period, effectively reducing the flicker frequency below the human visual threshold while maintaining the afterimage removal function at lower dimming frequencies.

The patent dynamically adjusts the duty cycles of multiple high pulse sections based on the dimming frequency. At lower dimming frequencies (60 Hz or below), the system introduces additional high pulse sections with progressively smaller duty cycles. This dynamic adjustment ensures that the effective flicker frequency remains above the human visual threshold while maintaining the afterimage removal function.

The patent changes the parameter of duty cycle across multiple high pulse sections to resolve the flicker issue. The first high pulse section has a larger duty cycle for primary illumination, while subsequent high pulse sections have progressively smaller duty cycles. This parameter change approach allows the system to maintain simple control logic while effectively reducing flicker by varying the timing parameters of multiple pulse sections.