Quality-retaining OLED dynamic voltage scaling for video streaming applications on mobile devices

• Published in: DAC Design Automation Conference 2012 pp. 1000 - 1005
• Main Authors: Chen, Xiang, Zheng, Jian, Chen, Yiran, Zhao, Mengying, Xue, Chun Jason
• Format: Conference Proceeding
• Language: English
• Published: New York, NY, USA ACM 03.06.2012; IEEE
• Series: ACM Conferences
• Subjects: Computer systems organization > Embedded and cyber-physical systems; Computer systems organization > Real-time systems; dynamic voltage scaling; Image color analysis; mobile device; OLED; Optimization; Organic light emitting diodes; Power demand; Regulators; Streaming media; video streaming; Voltage control; mobile device; OLED; video streaming; dynamic voltage scaling
• ISBN: 1450311997; 9781450311991
• ISSN: 0738-100X
• DOI: 10.1145/2228360.2228540

This paper developed a dynamic voltage scaling (DVS) technique for the power management of the OLED display on mobile devices in video streaming applications. An optimal voltage control scheme is proposed under input constraints. Fine-grained DVS technique is applied to maximize the power saving by leveraging the locality of the display content. The display quality is retained by monitoring structural-similarity-index (SSIM) during the optimization, subject to the hardware constraints like voltage regulator response time. Simulation results on four typical video test benchmarks show that the proposed technique saves 19.05%~49.05% OLED power on average while maintaining a high display quality (SSIM > 0.98) all the time. The power saving efficiency of the proposed technique varies at different display resolutions, refresh rates, and display contents.