Asymmetric Truncation Error Compensation for Digital Multimedia Broadcasting Mobile Phone Display

Chan-Ho HAN  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E90-C    No.11    pp.2136-2140
Publication Date: 2007/11/01
Online ISSN: 1745-1353
DOI: 10.1093/ietele/e90-c.11.2136
Print ISSN: 0916-8516
Type of Manuscript: Special Section LETTER (Special Section on Electronic Displays)
Category: 
Keyword: 
ADT (asymmetric data truncation),  DMB (digital multimedia broadcasting),  LCD driver,  pseudo-260k color,  

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Summary: 
The power reduction of display devices has become an important issue for extending battery life and running time when they are used in digital multimedia broadcasting (DMB) mobile phones. DMB mobile phones generally use 16-bit data per pixel to reduce power consumption even though a liquid crystal display (LCD) graphic controller can support 16-, 18-, and 24-bit data per pixel. Also, the total transmission time of 16-bit data per pixel is only half that for 18- and 24-bit data per pixel. Decoded 24-bit image data in the frame memory of a DMB decoder are asymmetrically truncated to 16-bit image data. This results in a lack of smoothness such as blocking effects and/or pseudo edge artifacts. To solve these problems, the author proposes and implements a new asymmetric pixel data truncation error compensation algorithm using 1-bit least significant bit (LSB) data expansion with correlated color information for the purpose of ensuring smoothness. In the experimental results, the proposed algorithm is able to correct various artifacts.