This paper introduces an optimized mini-LED backlight local dimming algorithm. The proposed algorithm leverages grayscale dispersion degree to establish the grayscale distribution interval within each backlight partition. Subsequently, the actual grayscale of all backlight partitions is determined using the root mean square formula. This approach enables the accurate restoration of the overall grayscale distribution characteristics across natural image types. A 55-inch LCD prototype with 2304 mini-LED backlight partitions is developed to implement the proposed algorithm alongside traditional local dimming algorithms.
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