Active matrix electro-optical device

Details Active matrix electro-optical device Active matrix electro-optical device

1999-11-02

2000-08-22

Dudek, James A.

Liquid crystal cells, elements and systems

Particular excitation of liquid crystal

Electrical excitation of liquid crystal

349 43, 349111, 257 72, 345 89, 345 92, G02F 1136, G09G 336, H01L 2978

Patent

active

06108056&

ABSTRACT:
In an active matrix display device integrated with a peripheral drive circuit using thin film transistors, when Vgr is a voltage required for one gradation, Ct is capacitance of all pixels, Cgd is capacitance between a gate and a drain, .DELTA.Vg is a difference between ON/OFF gate voltages, and .DELTA.Vs is a feedthrough voltage, the respective parameters satisfy an expression: .vertline.Vgr.vertline.>.vertline.(1/Ct) [Cgd.multidot..DELTA.Vg-Ct.multidot..DELTA.Vs].vertline.. According to this, even if dispersion occurs in the characteristics of the thin film transistors arranged for a buffer circuit or an active matrix circuit, it is possible to prevent the dispersion from influencing the gradation display.

REFERENCES:
patent: 5296847 (1994-03-01), Takeda et al.
patent: 5526012 (1996-06-01), Shibahara et al.
patent: 5691783 (1997-11-01), Numao et al.
patent: 5844538 (1998-12-01), Shiraki et al.
Nakanishi Hisao--"A Study of CRT Stray Emission with 2-D FEM" Technical Report of IEICE--No Date.

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