Patent ID: 8358392

Claim:
A lateral electric field type active-matrix addressing liquid crystal display device comprising: a first substrate including gate bus lines, common bus lines parallel to the gate bus lines, and drain bus lines intersected with the gate bus lines and the common bus lines; a second substrate held to be opposite to the first substrate at a predetermined gap; a liquid crystal layer placed between the first substrate and the second substrate; pixel regions defined by the gate bus lines and the drain bus lines to be arranged in a matrix array; and each of the pixel regions including a switching element, a pixel electrode electrically connected to the switching element, and a common electrode electrically connected to a corresponding one of the common bus lines; wherein in each of the pixel regions, at least one light-shielding layer is formed to extend along the drain bus lines that define the pixel electrode near the same drain bus lines; the at least one light-shielding layer is electrically isolated and is overlapped with at least one part of the pixel electrode corresponding to the pixel region in such a way that an insulating film intervenes between the at least one light-shielding layer and the at least one part, wherein the at least one part is extended along the drain bus lines in their vicinities; liquid crystal molecules confined in the liquid crystal layer are rotated in planes approximately parallel to the first substrate, thereby displaying images; and the electrically isolated light-shielding layer is electrically separated from the gate bus lines, the drain bus lines, the common bus lines, and the switching elements, and is arranged so that, in an operating state, an electric potential of the light-shielding layer is close to an electric potential of the corresponding pixel electrode so that a coupling capacitance between the drain bus lines and the light-shielding layer is very small.