Integrated image decompression and display driving for portable communication devices using DWTs
Nicholas A. Lawrence, Tim D. Wilkinson, WILLIAM A. CROSSLAND · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 2001
In portable communication devices there is a strong incentive to extend battery life through reduced power consumption of all system elements. This paper proposes a novel integration of image decompression and passive-matrix liquid crystal display driving through the application of DWT methods to the field of Multiple Line Addressing (MLA). This eliminates for the first time the need for data conversion between the decoded image and a format suitable for input to the display drivers. This is achieved by exploiting an inherent property of the liquid crystal to perform a 1-D inverse wavelet transform on the compressed incoming data. The paper presents a comparison of system performance for different wavelets, taking into account image compression rates, display performance and circuit complexity. It also presents a detailed system architecture and a discussion of the benefits and possible applications for such a scheme.