Display Device Local Dimming Signal Frequency Adaptation

The patent introduces an intermediary frequency value that serves as a mediator between the first frequency and the second frequency. When the image signal frequency is rapidly reduced, the processor transmits a local dimming signal based on this intermediate frequency to the backlight unit, rather than directly switching to the target frequency. This intermediate frequency acts as a buffer that allows the liquid crystal display to smoothly track frequency changes, preventing light output instability and wavy noise while maintaining the adaptability benefits of VRR operation.

The patent applies preliminary action by calculating and preparing an intermediate frequency value before the actual frequency transition occurs. When rapid frequency reduction is detected, the processor first determines this intermediate frequency and then transmits the corresponding local dimming signal to the backlight unit. This preliminary establishment of an intermediate frequency state allows the liquid crystal display to progressively adapt to frequency changes, preventing the light output tracking failure that would otherwise cause wavy noise, while maintaining the image synchronization benefits of VRR technology.