Patent ID: 6825494
Filing Date: 2004-11-30
Classification: H01L

Abstract:
A polycrystalline silicon thin film of a TFT in which probabilities P1 and P2 for which the maximum number of respective primary crystal grain boundaries for transistors TR1 and TR2 arranged perpendicular to each other are contained in active channel regions are represented as in the following:P1=(D1âˆ’(Nmax1âˆ’1)X*Gs1)/Gs1; P2=(D2âˆ’(Nmax2âˆ’1)X*Gs2)/Gs2; where P1 or P2 is not 0.5, D1=L1 cos &thgr;+W1 sin &thgr;, D2=L2 cos &thgr;+W2 sin &thgr;, L1 and L2 are lengths of active channels of the transistors TR1 and TR2, W1 and W2 are widths of active channels of the transistors TR1 and TR2, Nmax1 and Nmax2 are the maximum numbers of the primary crystal grain boundaries that are contained in the active channel regions for each of the transistors TR1 and TR2, Gs1 and Gs2 are crystal grain sizes having a fatal effect on characteristics of each of the transistors TR1 and TR2, and &thgr; is an angle in which the primary crystal grain boundaries are inclined at a direction perpendicular to an active channel direction of the respective transistors TR1 and TR2.