Patent ID: 6108056
Filing Date: 2000-08-22
Classification: G02F,G09G,H01L

Abstract:
An active matrix electro-optical device comprising:a substrate;an active matrix circuit including a pixel electrode over said substrate and a thin film transistor over said substrate, said thin film transistor being connected with said pixel electrode;an opposite electrode opposed to said pixel electrode;an electro-optical modulating layer provided between said pixel electrode and said opposite electrode;an auxiliary capacitance arranged in parallel with a pixel capacitance comprising said pixel electrode and said opposite electrode and said electro-optical modulating layer; anda black matrix comprising a conductive material overlapping with a periphery of said pixel electrode with an insulator therebetween,wherein said pixel electrode is provided for one of a pair of electrodes of said auxiliary capacitance, said black matrix is provided for the other of said pair of electrodes of said auxiliary capacitance, and said insulator is provided for a dielectric of said auxiliary capacitance, andwherein when Vgr is a voltage required for one gradation, Ct is a sum of said auxiliary capacitance and said pixel capacitance, Cgd is a capacitance between a gate and a drain of said thin film transistor of said active matrix circuit, .DELTA.Vg is a difference between ON/OFF gate voltages of said thin film transistor of said active matrix circuit, 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..