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Journal of Display Technology

Journal of Display Technology

| A JOINT IEEE/OSA PUBLICATION

  • Vol. 2, Iss. 3 — Sep. 1, 2006
  • pp: 292–299

Integer Wavelets for Displaying Gray Shades in RMS Responding Displays

T. N. Ruckmongathan, U. Manasa, R. Nethravathi, and A. R. Shashidhara

Journal of Display Technology, Vol. 2, Issue 3, pp. 292-299 (2006)


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Abstract

A large number of gray shades can be displayed in rms responding displays by using integer wavelets. The technique is demonstrated by displaying 64 gray shades in a twisted nematic liquid crystal display. We have reduced the hardware complexity of the display drivers by adding a few analog multiplexers that are common to a large number of stages (one for each output) in the drivers. A simple controller was implemented in a low cost complex programmable logic device.

© 2006 IEEE

Citation
T. N. Ruckmongathan, U. Manasa, R. Nethravathi, and A. R. Shashidhara, "Integer Wavelets for Displaying Gray Shades in RMS Responding Displays," J. Display Technol. 2, 292-299 (2006)
http://www.opticsinfobase.org/jdt/abstract.cfm?URI=jdt-2-3-292


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References

  1. T. N. Ruckmongathan, "Addressing techniques for RMS responding LCDs—A review," Proc. Jpn. Display '92 (1992) pp. 77-80.
  2. K. G. Panikumar, T. N. Ruckmongathan, "Displaying gray shades in passive matrix LCDs using successive approximation," Proc. 7th Asian Symp. on Inf. Display (ASID-2002) (2002) pp. 229-232.
  3. T. N. Ruckmongathan, P. Nanditha Rao, A. Prasad, "Wavelets for displaying gray shades in LCDs," 2005 Soc. Inf. Display Int. Symp. Dig. Tech. Papers pp. 168-171.
  4. T. N. Ruckmongathan, "Displaying gray shades in liquid crystal displays," Pramana 61, 313-329 (2003).
  5. T. N. Ruckmongathan, M. Govind, G. Deepak, "Reducing power consumption in passive matrix liquid crystal displays," IEEE Trans. Electron Devices 53, 1559-1566 (2006).
  6. A. R. Conner, T. J. Scheffer, "Pulse height modulation gray shading methods for passive matrix LCDs," Proc. 12th Int. Display Res. Conf. (Jpn. Display'92) pp. 69-72.
  7. S. Young, J. Lee, B. Lam, J. Ng, I. Tsoi, "Gray-scale addressing method by multi-order paraunitary/orthogonal building blocks," J. SID 8/4 283-288 (2000).
  8. T. N. Ruckmongathan, "A successive approximation technique for displaying gray shades in liquid crystal displays (LCDs)," IEEE Trans. Image Process. Paper TIP-2176–2006.

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