Patent ID: 6507383
Filing Date: 2003-01-14
Classification: G02F

Abstract:
A liquid crystal display unit including a pair of substrates, a liquid crystal layer disposed between said pair of substrates, a plurality of scanning signal lines, a plurality of image signal lines intersecting said plurality of scanning signal lines in matrix manner and a plurality of thin film transistors each formed in the vicinity of each intersection between said scanning signal lines and said image signal lines disposed on one of said substrates, a plurality of pixels at least one of which is formed in each area enclosed by said plurality of scanning signal lines and image signal lines and each of which includes a common signal electrode connected across a plurality of pixels and a pixel electrode connected to said thin film transistor corresponding thereto, said common signal electrode and said pixel electrode partially overlapping each other through an inter-layer insulation layer, at least part of each of said pixel electrode and said common signal electrode being constituted by a transparent conductive layer, one of said pixel electrode and said common signal electrode disposed on the side of said liquid crystal layer through an insulation layer being formed into slits or teeth of a comb,wherein at least one of insulation layers included in said inter-layer insulation layer is selectively formed in an area which is positioned above one of said pixel electrode and said common electrode which is disposed nearer to said one of substrates with said insulation layer therebetween and where said pixel electrode or said common electrode disposed above does not exist; and wherein a liquid crystal having &Dgr;âˆˆ of a negative value is used as said liquid crystal layer and when 1&Sum;k=ln&it;dk&varepsilon;kâ€ƒis SA where the number of insulation layers included in said inter-layer insulation layer is n and a dielectric constant of a k-th insulation layer is âˆˆk, a thickness thereof being dk, and 1(&Sum;i=lm&it;d1&varepsilon;1)+&Sum;k=ln&it;dk-&Sum;i=lm&it;d1&varepsilon;LC(where m&gE;1) is SB where the number of insulation layers disposed between a first orientation layer disposed above a first substrate and a first electrode of said pixel electrode and said common electrode, nearer to said first substrate through insulation layers in an area which is positioned above said first electrode and where a second electrode does not exist is m and a dielectric constant of an insulation layer constituting a first layer is âˆˆ1, a thickness thereof being d1, a dielectric constant of a liquid crystal in a vertical direction to a director of the liquid crystal being âˆˆLC, SAB is satisfied.