Ali Iranli
Massoud Pedram
ABSTRACT
This paper presents a temporally-aware backlight scaling (TABS) technique for video streams. The goal is to maximize energy saving in the display system by means of dynamic backlight dimming subject to a user-specified tolerance on the video distortion. The video distortion itself comprises of (i) an intra-frame (spatial) distortion component due to frame-sensitive backlight scaling and transmittance function tuning and (ii) an inter-frame (temporal) distortion component due to large-step backlight dimming across multiple frames and modulated by the physiological characteristics of the human visual system. The proposed backlight scaling technique is capable of efficiently computing the flickering effect online and subsequently using a measure of the temporal distortion to appropriately adjust the slack on the intra-frame spatial distortion. The proposed technique has been implemented on the Apollo Testbed II hardware platform. Actual current measurements on this platform demonstrate the superiority of TABS compared to previous backlight dimming techniques.
- N. Chang, et al., "DLS: Dynamic Backlight Luminance Scaling of Liquid Crystal Display," IEEE Transactions on VLSI Systems, Vol. 12, No. 8, Aug. 2004, pp.837--846. Google Scholar
Digital Library
- W-C. Cheng and M. Pedram, "Power Minimization in a Backlit TFT-LCD by Concurrent Brightness and Contrast Scaling," IEEE Trans. on Consumer Electronics, Vol. 50, No. 1, Feb. 2004, pp. 25--32. Google ScholarDigital Library
- A. Iranli, et al., "HEBS: Histogram Equalization for Backlight Scaling," Proceedings of DATE, Feb. 2005. Google ScholarDigital Library
- A. Iranli, M. Pedram, "DTM: Dynamic Tone Mapping for Backlight Scaling," Proceedings of DAC, Jun. 2005. Google ScholarDigital Library
- N. Graham and D. Hood, "Modeling the dynamics of light adaptation: The merging of two traditions," Vision Res.32, 1373--93, 1992Google ScholarCross Ref
- T.E. Wiegand, et al., "Testing a computational model of light-adaptation dynamics," Vision Res., 35(21), 3037--51, 1995.Google ScholarCross Ref
- http://apollo.usc.edu/testbed/Google Scholar
- B.H. Crawford, "Visual adaptation in relation to brief conditioning stimuli," Proceedings of the Royal Society B 134, 283--302.Google Scholar
Index Terms
- Backlight dimming in power-aware mobile displays
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