Liquid crystal display device

Abstract

A column for defining the interval between a TFT substrate and an opposed substrate is formed at a crossing point between a drain line and a scanning line. At the crossing point where the column is formed, the drain line is formed to have a wider width to prevent light leakage. Further, at the crossing point where the column is formed, the scanning line is formed to have a narrower width to prevent increase of capacitance between the drain line and the scanning line. The column is formed at a crossing point corresponding to a specific color, e.g., a blue pixel B, so that a difference in transmittance and in characteristic of thin film transistors due to formation of the column is initially compensated.

What is claimed is: 
     
         1 . A liquid crystal display device comprising:
 a first substrate;   a second substrate;   liquid crystal sealed between the first substrate and the second substrate;   a scanning line provided between the first substrate and the liquid crystal;   a drain line crossing the scanning line;   a thin film transistor having a semiconductor layer and a source electrode;   a common electrode above the scanning line, the drain line and the thin film transistor;   a first pixel electrode connected to the source electrode; and   a second pixel electrode adjacent to the first pixel electrode, wherein   the second pixel electrode has a slit,   the drain line has a portion parallel to a longitudinal direction of the slit,   the scanning line is between the first pixel electrode and the second pixel electrode in a plan view,   the semiconductor layer has a first region and a second region, and overlapped with the scanning line at the first region and the second region, and   a part of the semiconductor layer between the first region and the second region is located on the second pixel electrode side of the scanning line and overlaps with the second pixel electrode in a plan view.   
     
     
         2 . The liquid crystal display device according to  claim 1 ,
 wherein a part of the second pixel electrode overlaps with the scanning line in a plan view.   
     
     
         3 . The liquid crystal display device according to  claim 1 , further comprising: a spacer disposed between the first substrate and the second substrate,
 wherein the spacer is overlapped with the semiconductor layer, the drain line and the common electrode.   
     
     
         4 . The liquid crystal display device according to  claim 3 ,
 wherein the spacer is provided above the first substrate.   
     
     
         5 . The liquid crystal display device according to  claim 1 ,
 wherein the first region is a first channel region and the second region is a second channel region.   
     
     
         6 . The liquid crystal display device according to  claim 1 ,
 wherein the drain line has a first portion overlapped with the semiconductor layer in a plan view,   wherein a width of the first portion is different from a width of the drain line other than the first portion.   
     
     
         7 . The liquid crystal display device according to  claim 6 ,
 wherein the width of the first portion is wider than the width of the drain line other than the first portion.   
     
     
         8 . The liquid crystal display device according to  claim 1 ,
 wherein the scanning line has a first portion overlapped with one of the first region and the second region in a plan view,   wherein a width of the first portion is different from a width of the scanning line other than the first portion.   
     
     
         9 . The liquid crystal display device according to  claim 8 ,
 wherein the width of the scanning line other than the first portion is wider than the width of the first portion.   
     
     
         10 . The liquid crystal display device according to  claim 1 ,
 wherein the second pixel electrode has a first electrode portion and a second electrode portion,   the slit is between the first electrode portion and the second electrode portion, and   the first electrode portion and the second electrode portion are not connected to each other at the first pixel electrode side.   
     
     
         11 . A liquid crystal display device comprising:
 a first substrate;   a second substrate opposed to the first substrate;   liquid crystal sealed between the first substrate and the second substrate;   a scanning line above the first substrate and extending in a first direction;   a drain line above the first substrate and extending in a second direction crossing the first direction;   a thin film transistor having a semiconductor layer;   a first pixel electrode connected to the thin film transistor;   a second pixel electrode adjacent to the first pixel electrode in the second direction; and   a common electrode opposed to the first pixel electrode and the second pixel electrode,   wherein   the scanning line is between the first pixel electrode and the second pixel electrode in a plan view,   the semiconductor layer has a first region and a second region, and overlapped with the scanning line at the first region and the second region,   a part of the semiconductor layer between the first region and the second region is located on the second pixel electrode side of the scanning line and overlaps with the second pixel electrode in a plan view, and   a part of the second pixel electrode is located in an area between the scanning line and the part of the semiconductor layer.   
     
     
         12 . The liquid crystal display device according to  claim 11 ,
 wherein the second pixel electrode has a slit, and   a longitudinal direction of the slit is parallel to a portion of the drain line.   
     
     
         13 . The liquid crystal display device according to  claim 11 ,
 wherein the second pixel electrode has a portion overlap with the scanning line in a plan view.   
     
     
         14 . The liquid crystal display device according to  claim 11 ,
 wherein the first region is a first channel region and the second region is a second channel region.   
     
     
         15 . The liquid crystal display device according to  claim 11 ,
 wherein the drain line has a first portion overlapped with the semiconductor layer in a plan view,   wherein a width of the first portion is different from a width of the drain line other than the first portion.   
     
     
         16 . The liquid crystal display device according to  claim 15 ,
 wherein the width of the first portion is wider than the width of the drain line other than the first portion.   
     
     
         17 . The liquid crystal display device according to  claim 11 ,
 wherein the scanning line has a first portion overlapped with one of the first region and the second region in a plan view,   wherein a width of the first portion is different from a width of the scanning line other than the first portion.   
     
     
         18 . The liquid crystal display device according to  claim 17 ,
 wherein the width of the scanning line other than the first portion is wider than the width of the first portion.   
     
     
         19 . The liquid crystal display device according to  claim 11 ,
 wherein the first region overlaps with the drain line, and   wherein a gap is not between the second region and the second pixel electrode in a plan view.   
     
     
         20 . The liquid crystal display device according to  claim 12 ,
 wherein the second pixel electrode has a first electrode portion and a second electrode portion,   the slit is between the first electrode portion and the second electrode portion, and   the first electrode portion and the second electrode portion are not connected to each other at the first pixel electrode side.