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Journal of Display Technology

Journal of Display Technology


  • Vol. 5, Iss. 2 — Feb. 1, 2009
  • pp: 49–56

Low Power Techniques for Gray Shades in Liquid Crystal Displays

T. N. Ruckmongathan

Journal of Display Technology, Vol. 5, Issue 2, pp. 49-56 (2009)

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The largest transition in the select waveform of successive approximation technique is eliminated to reduce power dissipation in liquid crystal displays. Power dissipation in the driver circuit is analyzed for gray scale images by considering three select sequences. They are compared and a new select sequence is proposed to achieve low power dissipation. An additional pulse is introduced in the select waveform to reduce peak amplitude of select and data waveforms to achieve a low supply voltage for the driver circuit.

© 2009 IEEE

T. N. Ruckmongathan, "Low Power Techniques for Gray Shades in Liquid Crystal Displays," J. Display Technol. 5, 49-56 (2009)

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  1. T. N. Ruckmongathan, M. Govind, G. Deepak, "Reducing power consumption in liquid-crystal displays," IEEE Trans. Electron Devices 53, 1559-1566 (2006).
  2. T. N. Ruckmongathan, "Techniques for reducing the hardware complexity and the power consumption of drive electronics," Proc. Asian Symp. on Inf. Display (ASID'06) (2006) pp. 115-120.
  3. K. G. PaniKumar, T. N. Ruckmongathan, "Displaying gray shades in passive matrix LCDs using successive approximation," Proc. 7th Asian Symp. on Inf. Display (ASID2002) (2002) pp. 229-232.
  4. T. N. Ruckmongathan, "A successive approximation technique for displaying gray shades in liquid crystal displays (LCDs)," IEEE Trans. Image Process. 16, 554-561 (2007).
  5. T. N. Ruckmongathan, U. Manasa, R. Nethravathi, A. R. Shashidhara, "Integer wavelets for displaying gray shades in RMS responding displays," J. Display Technol. 2, 292-299 (2006).
  6. T. N. Ruckmongathan, V. Arun, B. H. Kumar, "Line-by-line addressing of RMS responding matrix displays with wavelets," J. Display Technol 3, 413-420 (2007).
  7. H. Kawakami, H. Hanmura, E. Kaneko, "Brightness uniformity in liquid crystal displays," SID-'80 Dig., Proc. Int. Symp. Soc. Inf. Display (1980) pp. 28-29.
  8. Y. Suzuki, M. Sekiya, K. Arai, A. Ohkoshi, "A liquid crystal image display," SID-'83 Dig., Proc. Int. Symp. Soc. Inf. Display (1983) pp. 32-33.
  9. A. R. Conner, T. J. Scheffer, "Pulse height modulation (PHM) gray shading methods for passive matrix LCDs," Proc. Japan Display'92 69-72 (1992).
  10. H. Mono, S. Nishitani, K. Kondo, J. Taguchi, H. Kawakami, "An eight-gray-level drive method for fast-responding STN-LCDs," SID'93 Dig., Proc. Int. Symp. Soc. Inf. Display (1993) pp. 93-96.
  11. B. W. Marks, "Power reduction in liquid crystal display modules," IEEE Trans. Electron Devices ED-29, 1884-1886 (1982).

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