Liquid crystal display device

Abstract

A transverse electric field-type liquid crystal display device displays by rotating homogeneous-aligned liquid crystals by a transverse electric field substantially parallel to a substrate, applied across a pixel electrode and a common electrode, assuring sufficient storage capacitance while enlarging the area of driving the liquid crystal molecules in a sub pixel. A source pixel electrode connected to a source electrode extends along the data line, a storage capacitance electrode formed by the same layer as the data line is formed above an adjacent scan line so as to overlap the adjacent scan line, the source pixel electrode is disposed so as to be connected to the storage capacitance electrode and a pixel along one side, an interlayer film is formed over the source pixel electrode, and a pixel electrode and a common electrode formed by a transparent conductive film are formed over the interlayer film.

What is claimed is: 
     
         1 . A liquid crystal display device of a transverse electric field type performing display by rotating horizontal-aligned liquid crystals by a transverse electric field which is applied across a pixel electrode and a common electrode and is substantially parallel to a substrate, comprising:
 a substrate having a plurality of data lines disposed in parallel and a plurality of scan lines disposed substantially perpendicular to the data lines and in parallel to one another, and having thin film transistors corresponding to respective sub pixels aligned in a matrix surrounded by the data lines and the scan lines and disposed around intersections between the data lines and the scan lines;   an electric potential supply line extending along the data line in the sub pixel region and connected to a source electrode of the thin film transistor; and   a storage capacitance electrode continued to the electric potential supply line, disposed above the scan line via an insulating layer, and generating capacitance between the scan line and itself,   wherein the pixel electrode has pixel electrode first parts and a pixel electrode second part,   the pixel electrode first parts are disposed in a layer upper than the electric potential supply line in the sub pixel region and linearly formed in substantially parallel to the scan line,   the pixel electrode second part is continued to the pixel electrode first parts, formed in parallel to the data line, and connected to the electric potential supply line,   the common electrode has common electrode first parts and a common electrode second part,   the common electrode first parts are aligned opposed to the pixel electrode first parts, apart from the pixel electrode first parts at same distance, and generate an electric field substantially parallel to the substrate, and   the common electrode second part is continued to the common electrode first parts and provided above the storage capacitance electrode via an insulating film.   
     
     
         2 . The liquid crystal display device according to  claim 1 , wherein the electric potential supply line and the storage capacitance electrode are continued and formed in a substantially L shape around an intersection of the data line and the scan line. 
     
     
         3 . The liquid crystal display device according to  claim 1 , wherein the storage capacitance electrode covers the scan line, and the common electrode second part covers the storage capacitance electrode. 
     
     
         4 . The liquid crystal display device according to  claim 1 , wherein an interval of the plurality of data lines is set to be larger than an interval of the plurality of scan lines. 
     
     
         5 . A liquid crystal display device of a transverse electric field type performing display by rotating horizontal-aligned liquid crystals by a transverse electric field which is applied across a pixel electrode and a common electrode and is substantially parallel to a substrate, comprising:
 a substrate having a plurality of data lines disposed in parallel and a plurality of scan lines disposed substantially perpendicular to the data lines and in parallel to one another, and having thin film transistors corresponding to respective sub pixels aligned in a matrix surrounded by the data lines and the scan lines and disposed around intersections between the data lines and the scan lines;   an electric potential supply line extending along the data line in the sub pixel region and connected to a source electrode of the thin film transistor; and   a storage capacitance electrode continued to the electric potential supply line, disposed above the scan line via an insulating layer, and generating capacitance between the scan line and itself,   wherein the pixel electrode expands in a plane shape above the electric potential supply line within the sub pixel region and is connected to the electric potential supply line, the common electrode has common electrode first parts and a common electrode second part,   the common electrode first parts are aligned facing the pixel electrode above the pixel electrode via an insulating layer and generate, between the pixel electrode and themselves, an electric field substantially parallel to the substrate, and   the common electrode second part is continued to the common electrode first parts and provided above the storage capacitance electrode via an insulating film.   
     
     
         6 . The liquid crystal display device according to  claim 5 , wherein the electric potential supply line and the storage capacitance electrode are continued and formed in a substantially L shape around an intersection of the data line and the scan line. 
     
     
         7 . The liquid crystal display device according to  claim 5 , wherein the storage capacitance electrode covers the scan line, and the common electrode second part covers the storage capacitance electrode. 
     
     
         8 . The liquid crystal display device according to  claim 5 , wherein an interval of the plurality of data lines is set to be larger than an interval of the plurality of scan lines. 
     
     
         9 . A liquid crystal display device of a transverse electric field type performing display by rotating horizontal-aligned liquid crystals by a transverse electric field which is applied across a pixel electrode and a common electrode and is substantially parallel to a substrate, comprising:
 a substrate having a plurality of data lines disposed in parallel and a plurality of scan lines disposed substantially perpendicular to the data lines and in parallel to one another, and having thin film transistors corresponding to respective sub pixels aligned in a matrix surrounded by the data lines and the scan lines and disposed around intersections between the data lines and the scan lines;   an electric potential supply line extending along the data line in the sub pixel region and connected to a source electrode of the thin film transistor; and   a storage capacitance electrode continued to the electric potential supply line, disposed above the scan line via an insulating layer, and generating capacitance between the scan line and itself,   wherein the common electrode expands in a plane shape above the electric potential supply line within the sub pixel region and is connected to the electric potential supply line,   the pixel electrode has pixel electrode first parts and a pixel electrode second part,   the pixel electrode first parts are aligned facing the common electrode above the common electrode via the insulating layer and generate, between the common electrode and themselves, an electric field substantially parallel to the substrate, and   the pixel electrode second part is continued to the pixel electrode first parts and provided above the electric potential supply line via an insulating film.   
     
     
         10 . The liquid crystal display device according to  claim 9 , wherein the electric potential supply line and the storage capacitance electrode are continued and formed in a substantially L shape around an intersection of the data line and the scan line. 
     
     
         11 . The liquid crystal display device according to  claim 9 , wherein an interval of the plurality of data lines is set to be larger than an interval of the plurality of scan lines.