TFT/LCD: liquid-crystal displays addressed by thin-film by Toshihisa Tsukada

By Toshihisa Tsukada

TFT/LCD is the 1st publication of its variety characterizing thin-film-transistor-addressed liquid-crystal screens. With chapters and illustrations prepared for simple comprehension, this identify starts with a common evaluation of TFT/LCDs, by way of thorough descriptions in their layout, fabrication, features, units, fabrics and easy ideas. the themes coated are interdisciplinary to correspond to the various fields with regards to TFT/LCDs. the original gains attributed to TFT/LCDs are derived from the combo of amorphous semiconductors and liquid crystals, the 2 most crucial fabrics tested. gadget features and fabrics are mentioned basically when it comes to how they relate to demonstrate applied sciences. This publication may be most dear to these engaged in TFT/LCD study and improvement, and of significant curiosity to participants operating within the fields of client electronics, and machine and communications engineering. TFT/LCD may also be useful to these learning solid-state physics, mesophase chemistry, and digital units and structures.

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Extra resources for TFT/LCD: liquid-crystal displays addressed by thin-film transistors, 1st Edition

Example text

16 Threshold voltage shift as a function of stress time. 34 for Vg=-10 v. mixed together and there are no universally applicable guidelines for determining the deposition conditions. 22). The stress-free condition does not necessarily correspond to the lowest V t shift. The stoichiometric composition (Si3 N4 ) and a substrate temperature of about 300°C are preferred. The V t shift mechanism has been discussed by Powell 10 , who implied from a simple analogy to conventional MOS FETs that the charge trapping in the SiN gate insulator causes this shift.

7) The drain conductance is a linear function of V g , and the transconductance is proportional to V d . Saturation of the drain current occurs when dI d /dV d =0, due to pinch-off of the conducting channel in the neighborhood of the drain. 8) for V d V g -V t . 9) The high-frequency performance of a-Si:H TFTs can be estimated from the gain-bandwidth product, which is equivalent to the maximum operating frequency defined for crystalline silicon devices. 12) at the saturation region (V d >V g -V t).

Colorimetric Design The colorimetric system of the TFT/LCD is designed according to the chromaticity diagram recommended by the 1931 CIE (Commission Internationale de l'Eclairage) conference. Any color can be matched by additively mixing the three primary colors according to the spectral tristimulus values or color matching functions obtained for all visible wavelengths. The average of the tristimulus values of many observers are represented by ( ), ( ), and ( ). The CIE-RGB standard colorimetric system corresponds to the observation of color with a viewing angle of two degrees and is called the XYZ colorimetric system.

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