JSTS:Journal of Semiconductor Technology and Science

The Institute of Electronics and Information Engineers (대한전자공학회)
권호 표지

Circuit Techniques for Low-Power Data Drivers of TFT-LCDs

  • Choi, Byong-Deok (Hanyang. University, Division of Electrical and Computer Engineering) ;
  • Kwon, Oh-Kyong (Hanyang. University, Division of Electrical and Computer Engineering)
  • Published : 2001.09.01
Download PDF
⟨ Previous Next ⟩

Abstract

A stepwise driving method was used for reducing the AC power consumption in a TFT-LCD. The AC power takes the largest portion of the total power consumption of a TFT-LCD. Experimental results confirmed that the AC power saving efficiency reached up to 75% when a 5-stepwise driving with each step time of $2\mu$ sec was applied to a 14.1 inch-diagonal XGA TFT-LCD. The second largest component of power consumption called the DC power comes from the quiescent currents in Op-amps. A simple and efficient architecture was proposed in this work to reduce this DC power consumption: Half of the Op-amps have the 5V-supplies, and the rest half have the 10V-supplies, and two Op-amps are shared by adjacent two channels. Measurements of test circuits showed that this simple method could reduce over 40% of the DC power consumption..

Keywords

References

  1. H. Okada et al., 'An 8.4-in. TFT-LCD System for a Note-Size Computer Using 3-Bit Digital Data Drivers,' in Proc. of The 12th Int. Display Research Conf., pp. 475-478, Hiroshima, Japan, October 1992
  2. H. Okumura et al., 'Multi-Field Driving Method for Reducing LCD Power Consumption,' in Soc. for Information Display Int. Sym. Digest of Tech. Papers Vol.XXVI, pp. 249-252, Orlando, United States, May 1995
  3. A. Erhart et al., 'Charge-Conservation Implementation in an Ultra-Low-Power AMLCD Column Driver Utilizing Pixel Inversion,' in Soc. for Information Display Int. Sym. Digest of Tech. Papers Vol. XXVIII, pp. 23-26, Boston, United States, May 1997
  4. Y.C. Sung et al., 'A Low-Power Data Driver for TFTLCDs,' in Soc. for Information Display Int. Sym. Digest of Tech. Papers Vol. XXXI, pp. 142-145, Long Beach, United States, May 2000
  5. K. Meinstein et al., 'A Low-Power High-Voltage Column/Dot Inversion Drive System,' in Soc. for Information Display Int. Sym. Digest of Tech. Papers Vol. XXVI, pp. 391-394, Orlando, United States, May 1995
  6. T. Itakura et al., '$10{\mu}$ A Quiescent Current Opamp Design for An LCD Driver IC,' in IDW'96, pp.305-308, Kobe, Japan, November 1996
  7. P.C. Yu et al., 'A Class-B Output Buffer for Flat-Panel-Display Column Driver,' IEEE Journal of Solid-State Circuits, vol.34, no.1, pp.116-119, January 1999 https://doi.org/10.1109/4.736665
  8. L. 'J.' Svensson et al., 'Driving a Capacitive Load without Dissipating fCV2,' in Proc. of the 1994 IEEE Symposium on Low Power Design, pp. 100-101, UnitedStates, October 1994 https://doi.org/10.1109/LPE.1994.573220
  9. L. Svensson, 'Adiabatic Switching,' in Low Power Digital CMOS Design, A. P. Chandrakasan. Norwell, Massachusetts: Kluwer, 1995, pp.181-218
  10. http://www.isi.edu/acmos/acmosPaper.html (L. 'J.' Svensson, et al., 'Adiabatic charging without inductors,' in USC technical reports ACMOS-TR-3a, February1994.)