On-chip frame memory reduction using a high-compression-ratio codec in the overdrives of liquid-crystal displays

Jun Wang; Kyeong-yuk Min; Jong-Wha Chong

doi:10.1117/1.3509370

1 November 2010 On-chip frame memory reduction using a high-compression-ratio codec in the overdrives of liquid-crystal displays

Jun Wang, Kyeong-yuk Min, Jong-Wha Chong

Author Affiliations +

Optical Engineering, Vol. 49, Issue 11, 117005 (November 2010). https://doi.org/10.1117/1.3509370

Abstract

Overdrive is commonly used to reduce the liquid-crystal response time and motion blur in liquid-crystal displays (LCDs). However, overdrive requires a large frame memory in order to store the previous frame for reference. In this paper, a high-compression-ratio codec is presented to compress the image data stored in the on-chip frame memory so that only 1 Mbit of on-chip memory is required in the LCD overdrives of mobile devices. The proposed algorithm further compresses the color bitmaps and representative values (RVs) resulting from the block truncation coding (BTC). The color bitmaps are represented by a luminance bitmap, which is further reduced and reconstructed using median filter interpolation in the decoder, while the RVs are compressed using adaptive quantization coding (AQC). Interpolation and AQC can provide three-level compression, which leads to 16 combinations. Using a rate-distortion analysis, we select the three optimal schemes to compress the image data for video graphics array (VGA), wide-VGA LCD, and standard-definitionTV applications. Our simulation results demonstrate that the proposed schemes outperform interpolation BTC both in PSNR (by 1.479 to 2.205 dB) and in subjective visual quality.

©(2010) Society of Photo-Optical Instrumentation Engineers (SPIE)

Citation Download Citation

Jun Wang, Kyeong-yuk Min, and Jong-Wha Chong "On-chip frame memory reduction using a high-compression-ratio codec in the overdrives of liquid-crystal displays," Optical Engineering 49(11), 117005 (1 November 2010). https://doi.org/10.1117/1.3509370

Published: 1 November 2010

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