Abstract

Modern flat panel displays, including thin-film transistor liquid crystal displays (TFT-LCDs) and organic light-emitting diodes (OLEDs), pursue more and more natural color expression. This requires the data driving system should produce very fine and accurate signal voltages or currents. Especially, the uniformity among channels of a driving system is critically important because the color or luminance differences among columns are easily noticeable. We propose a simple and efficient driving method for solving the artifacts caused by the existing nonuniformity among channels of a driving system, and confirms its impact by simulations using C-programming. The nonuniformity among channels mostly stem from the random offset of the output circuits of a driving system, which in turn is caused by the process variations. The proposed driving method shares $N$-output circuits between $N$-output channels such that the existing offsets of the channels are averaged out. Thus, the output signal error due to the offsets spreads out among the channels, improving the uniformity between the channels.

© 2006 IEEE

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References

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IEEE J. Solid State Circuits (2)

M. C. W. Coln, "Chopper stabilization of MOS operational amplifiers using feed-forward techniques," IEEE J. Solid State Circuits 16, 745-748 (1981).

C. Menolfi, Q. Huang, "A fully integrated, untrimmed CMOS instrumentation amplifier with submicrovolt offset," IEEE J. Solid State Circuits 34, 415-420 (1999).

IEEE J. Solid State Circuits (2)

M. Degrauwe, E. Vittoz, I. Verbaushede, "A microwave CMOS-instrumentation amplifier," IEEE J. Solid State Circuits 20, 805-807 (1985).

C.-G. Yu, R. L. Geiger, "An automatic offset compensation scheme with ping-pong control for CMOS operational amplifiers," IEEE J. Solid State Circuits 29, 601-610 (1994).

IEEE J. Solid-State Circuits (1)

A. Bakker, K. Thiele, J. H. Huijsing, "A CMOS nested-chooper instrumentation amplifier with 100-nV offset," IEEE J. Solid-State Circuits 35, 1877-1883 (2000).

in Dig. Soc. Inf. Display'91 (1)

H. Mano, T. Furuhashi, T. Tanaka, "Multicolor display control method for TFT-LCD," in Dig. Soc. Inf. Display'91 547-550 (1991).

in Dig. Soc. Inf. Display'92 (1)

M. Hirose, F. Inoue, N. Kabuto, H. Kataoka, K. Masuda, "5-bit TV pictures on 3-bit color TFT-LCDs using alternating dither," in Dig. Soc. Inf. Display'92 597-600 (1992).

Inf. Display (3)

D. McCartney, "Shifting LCD panels into overdrive," Inf. Display 20, 12-15 (2004).

D. McCartney, "Tuning LCDs to tune in TV," Inf. Display 20, 14-17 (2004).

P. Sicard, "Trends in video electronics," Inf. Display 21, 10-13 (2005).

Proc. IEEE (1)

C. C. Enz, G. C. Temes, "Circuit techniques for reducing the effects of op-amp imperfection: Autozeroing, correlated double sampling, and chopper stablilization," Proc. IEEE 84, 1584-1614 (1996).

Other (3)

S. S. Kim, B. H. Berkeley, J. H. Park, T. Kim, D. G. Kim, "Super PVA achieves ultimate LCD-TV performance leadership," Proc. 5th Int. Meeting on Inf. Display (2005) pp. 15-20.

Microsoft, Visual C++ MSDN Microsoft (1994).

Intel, Open Source Computer Vision Library Intel (2000).

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