MDC-X: multi-plane mura data compression in display devices

초록

Mura compensation is essential for maintaining the display quality. However, the large volume of Mura compensation data significantly increases memory cost and system complexity. Previous compression methods offer a certain level of compression ratio, but they are limited by degraded compensation performance in low-gray regions, blocking artifacts caused by slice clustering, and inherent limitations in achievable compression ratios. To overcome these limitations, we propose a new Mura data compression algorithm (MDC-X) that utilizes both multi-plane similarity and local similarity. The proposed method applies Differential Pulse Code Modulation (DPCM) to a reference plane and performs slice-based linear approximation for the remaining planes, thereby achieving high-efficiency model-based compression. Experimental results demonstrate that MDC-X maintains high reconstruction quality, while supporting a wide range of compression ratios, from 5:1 to 42:1, depending on the number of planes and slice sizes. Specifically, evaluations conducted on 37 diverse test panels demonstrate that MDC-X achieves an aggregate average PSNR of 60.24 dB at a 7.5:1 compression ratio, a value derived from the integrated performance across the , , and planes. In addition, the reference-plane-based reconstruction structure effectively prevents blocking artifacts caused by clustering, and the compression ratio increases proportionally as the number of planes grows. These findings show that MDC-X is a practical compression solution capable of simultaneously reducing memory cost and ensuring compensation performance in display manufacturing processes.

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