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

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  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.

IEEE Trans. Electron Devices

T. N. Ruckmongathan, M. Govind, G. Deepak, "Reducing power consumption in passive matrix liquid crystal displays," IEEE Trans. Electron Devices 53, 1559-1566 (2006).

IEEE Trans. Image Process.

T. N. Ruckmongathan, "A successive approximation technique for displaying gray shades in liquid crystal displays (LCDs)," IEEE Trans. Image Process. Paper TIP-2176–2006.

J. SID 8/4

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).

Pramana

T. N. Ruckmongathan, "Displaying gray shades in liquid crystal displays," Pramana 61, 313-329 (2003).

Other

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.

T. N. Ruckmongathan, "Addressing techniques for RMS responding LCDs—A review," Proc. Jpn. Display '92 (1992) pp. 77-80.

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.

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.

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