Liquid crystal display device and manufacturing method thereof

Abstract

A liquid crystal display device is provided with a pair of substrates which are arranged to face each other in an opposed manner and a liquid crystal layer which is sandwiched between main surfaces of a pair of substrates. On the main surface of one of the pair of substrates which faces the liquid crystal layer, pixel regions including switching elements, pixel electrodes which are connected to the switching elements and a protective film which is disposed at liquid crystal layer side of the switching elements are formed. In such a liquid crystal device, the protective film is formed by laminating the plurality of material layers which include at least a first material layer and a second material layer which is arranged closer to the liquid crystal layer side than the first material layer. Further, the second material layer exhibits resistivity which is lower than resistivity of the first material layer and higher than resistivity of silicon or semiconductor layers which constitute channels of the switching elements. Due to such a constitution, the image retention which is generated on a display screen of the liquid crystal display device can be reduced.

1 . A liquid crystal display device, comprising: 
 a pair of substrates being arranged opposite to each other; and    a liquid crystal layer being interposed between main surfaces of the pair of substrates,    a plurality of pixel regions each of which includes a switching element, a pixel electrode connected to the switching element and at least two films,    wherein the at least two films each includes SiN.    
   
   
       2 . A liquid crystal display device according to  claim 1 , 
 wherein one film of the at least two films is arranged closer to the liquid crystal layer and exhibits resistivity which is lower than the resistivity of each the other.    
   
   
       3 . A liquid crystal display device according to  claim 1 , 
 wherein one film of the at least two films, which is arranged closer to the liquid crystal layer and is thinner than the other of the at least two films near the liquid crystal layer.    
   
   
       4 . A liquid crystal display device according to  claim 1 , 
 wherein the pixel regions each includes the counter electrode,    wherein the pixel electrode and the counter electrode are disposed so that the liquid crystal display comprises the IPS type.    
   
   
       5 . A liquid crystal display device according to  claim 4 , 
 wherein the one film of the at least two films is disposed between the pixel electrode and the switching.    
   
   
       6 . A liquid crystal display device according to  claim 1 , 
 wherein the pixel regions each includes the counter electrode,    wherein the pixel electrode and the counter electrode are disposed so that the liquid crystal display comprises the TN type.    
   
   
       7 . A liquid crystal display device according to  claim 6 , 
 wherein the one film of the at least two films is disposed between the pixel electrode and the switching.    
   
   
       8 . A liquid crystal display device according to  claim 1 , 
 wherein the pixel regions each includes the counter electrode,    wherein the pixel electrode and the counter electrode are disposed so that the liquid crystal display comprises the VA type.    
   
   
       9 . A liquid crystal display device according to  claim 8 , 
 wherein the one film of the at least two films is disposed between the pixel electrode and the switching.    
   
   
       10 . A liquid crystal display device according to  claim 8 , 
 wherein the films are formed on the other substrate.    
   
   
       11 . A liquid crystal display device, comprising: 
 a pair of substrates being arranged opposite to each other; and    a liquid crystal layer being interposed between main surfaces of the pair of substrates,    a plurality of pixel regions each of which includes a switching element, a pixel electrode connected to the switching element and a film including SiN,    wherein the composition ratio of nitrogen with respect to silicon in the closer side of the film from the liquid crystal layer is higher than the far side.    
   
   
       12 . A liquid crystal display device according to  claim 11 , 
 wherein the pixel regions each includes the counter electrode,    wherein the pixel electrode and the counter electrode are disposed so that the liquid crystal display comprises the IPS type.    
   
   
       13 . A liquid crystal display device according to  claim 12 , 
 wherein the one film of the at least two films is disposed between the pixel electrode and the switching.    
   
   
       14 . A liquid crystal display device according to  claim 11 , 
 wherein the pixel regions each includes the counter electrode,    wherein the pixel electrode and the counter electrode are disposed so that the liquid crystal display comprises the TN type.    
   
   
       15 . A liquid crystal display device according to  claim 14 , 
 wherein the one film of the at least two films is disposed between the pixel electrode and the switching.    
   
   
       16 . A liquid crystal display device according to  claim 11 , 
 wherein the pixel regions each includes the counter electrode,    wherein the pixel electrode and the counter electrode are disposed so that the liquid crystal display comprises the VA type.    
   
   
       17 . A liquid crystal display device according to  claim 16 , 
 wherein the one film of the at least two films is disposed between the pixel electrode and the switching.    
   
   
       18 . A liquid crystal display device according to  claim 17 , 
 wherein the films are formed on the other substrate.