LCD panel and method of fabricating same

Abstract

A method of fabricating an LCD panel is provided, which forms a uniform gap between a pair of transparent substrates over the whole display area, provides high display quality, and decreases the contamination level to liquid crystal of sealing material. This method comprises the steps of: (a) providing a first transparent substrate; (b) providing a second transparent substrate; (c) forming a first sealing member on the first transparent substrate to surround a display area; the first sealing member being used for sealing a liquid crystal; the first sealing member having a first closed pattern; (d) forming a second sealing member on the first or second substrate to surround the first sealing member; the second sealing member having a second closed pattern; (e) dropping a liquid crystal on the first or second substrate in the display area; (f) coupling the first and second substrates with each other to form a gap between the first and second substrates in a vacuum atmosphere, forming a closed inner space between the first and second substrates by the first and second sealing members; the liquid crystal being confined in the inner space; (g) curing the second sealing member after the step (f); and (h) curing the first sealing member after the step (f). The steps (g) and (h) are performed at different times from each other.

What is claimed is:  
     
         1 . A method of fabricating a LCD panel, comprising the steps of: 
 (a) providing a first transparent substrate;    (b) providing a second transparent substrate;    (c) forming a first sealing member on the first transparent substrate to surround a display area; 
 the first sealing member being used for sealing a liquid crystal;  
 the first sealing member having a first closed pattern;  
   (d) forming a second sealing member on the first or second substrate to surround the first sealing member; 
 the second sealing member having a second closed pattern;  
   (e) dropping a liquid crystal on the first or second substrate in the display area;    (f) coupling the first and second substrates with each other to form a gap between the first and second substrates in a vacuum atmosphere, forming a closed inner space between the first and second substrates by the first and second sealing members; 
 the liquid crystal being confined in the inner space;  
   (g) curing the second sealing member after the step (f); and    (h) curing the first sealing member after the step (f); 
 wherein the steps (g) and (h) are performed at different times from each other.  
   
     
     
         2 . The method according to  claim 1 , wherein the step (h) of curing the first sealing member is performed in a period ranging from 5 minutes to 120 minutes after the step (g) of curing the second sealing member is completed.  
     
     
         3 . The method according to  claim 1 , wherein the first sealing member is made of a thermosetting resin.  
     
     
         4 . The method according to  claim 1 , wherein the first sealing member is made of a thermosetting resin and the second sealing member is made of a UV curing resin.  
     
     
         5 . The method according to  claim 1 , wherein a material for the first sealing member is lower in viscosity than a material for the second sealing member.  
     
     
         6 . The method according to  claim 1 , wherein a material for the first sealing member has a viscosity in a range from 1,000 Ns/m 2  to 10,000 Ns/m 2 .  
     
     
         7 . The method according to  claim 1 , wherein a material for the second sealing member has a viscosity in a range from 6,000 Ns/m 2  to 100,000 Ns/m 2 .  
     
     
         8 . The method according to  claim 1 , wherein a material for the first sealing member has a viscosity in a range from 1,000 Ns/m 2  to 10,000 Ns/m 2  and a material for the second sealing member has a viscosity in a range from 6,000 Ns/m 2  to 100,000 Ns/m 2 .  
     
     
         9 . A method of fabricating a LCD panel, comprising the steps of: 
 (a) providing a first transparent substrate;    (b) providing a second transparent substrate;    (c) forming a first sealing member on the first transparent substrate to surround a display area; 
 the first sealing member being used for sealing a liquid crystal;  
 the first sealing member having a first closed pattern;  
   (d) forming a second sealing member on the first or second substrate to surround the first sealing member; 
 the second sealing member having a second closed pattern;  
   (e) dropping a liquid crystal on the first or second substrate in the display area;    (f) coupling the first and second substrates with each other to form a gap between the first and second substrates in a vacuum atmosphere, forming a closed inner space between the first and second substrates by the first and second sealing members; 
 the liquid crystal being confined in the inner space;  
   (g) curing the second sealing member after the step (f);    (h) keeping the coupled first and second substrates in an atmosphere that uniformizes the gap between the coupled first and second substrates after the step (h); and    (i) curing the first sealing member after the step (h).    
     
     
         10 . The method according to  claim 9 , wherein the step (h) of curing the first sealing member is performed in a period ranging from 5 minutes to 120 minutes after the step (g) of curing the second sealing member is completed.  
     
     
         11 . The method according to  claim 9 , wherein the first sealing member is made of a thermosetting resin.  
     
     
         12 . The method according to  claim 9 , wherein the first sealing member is made of a thermosetting resin and the second sealing member is made of a UV curing resin.  
     
     
         13 . The method according to  claim 9 , wherein a material for the first sealing member is lower in viscosity than a material fort the second sealing member.  
     
     
         14 . The method according to  claim 9 , wherein a material for the first sealing member has a viscosity in a range from 1,000 Ns/m 2  to 10,000 Ns/m 2 .  
     
     
         15 . The method according to  claim 9 , wherein a material for the second sealing member has a viscosity in a range from 6,000 Ns/m 2  to 100,000 Ns/m 2 .  
     
     
         16 . The method according to  claim 9 , wherein a material for the first sealing member has a viscosity in a range from 1,000 Ns/m 2  to 10,000 Ns/m 2  and a material for the second sealing member has a viscosity in a range from 6,000 Ns/m 2  to 100,000 Ns/m 2 .  
     
     
         17 . A method of fabricating a LCD panel, comprising the steps of: 
 (a) providing a first transparent substrate;    (b) providing a second transparent substrate;    (c) forming a first sealing member on the first transparent substrate to surround a display area; 
 the first sealing member being made of a thermosetting resin;  
 the first sealing member being used for sealing a liquid crystal;  
 the first sealing member having a first closed pattern;  
   (d) forming a second sealing member on the first or second substrate to surround the first sealing member; 
 the second sealing member being made of a UV curing resin;  
 the second sealing member having a second closed pattern;  
   (e) dropping a liquid crystal on the first or second substrate in the display area;    (f) coupling the first and second substrates with each other to form a gap between the first and second substrates in a vacuum atmosphere, forming a closed inner space between the first and second substrates by the first and second sealing members; 
 the liquid crystal being confined in the inner space;  
   (g) curing the second sealing member after the step (f); and    (h) curing the first sealing member after the step (f). 
 The steps (g) and (h) are performed at different times from each other.  
   
     
     
         18 . The method according to  claim 17 , wherein a material for the first sealing member is lower in viscosity than a material fort the second sealing member.  
     
     
         19 . The method according to  claim 17 , wherein a material for the first sealing member has a viscosity in a range from 1,000 Ns/m 2  to 10,000 Ns/m 2 .  
     
     
         20 . The method according to  claim 17 , wherein a material for the second sealing member has a viscosity in a range from 6,000 Ns/m 2  to 100,000 Ns/m 2 .  
     
     
         21 . The method according to  claim 17 , wherein a material for the first sealing member has a viscosity in a range from 1,000 Ns/m 2  to 10,000 Ns/m 2  and a material for the second sealing member has a viscosity in a range from 6,000 Ns/m 2  to 100,000 Ns/m 2 .  
     
     
         22 . A LCD panel comprising: 
 (a) a first transparent substrate;    (b) a second transparent substrate coupled with the first substrate to form a gap between the first and second substrates; 
 a closed inner space being formed between the first and second substrates by a first sealing member;  
 the first sealing member being formed to surround a display area;  
 the first sealing member having a first closed pattern; and  
   (c) a liquid crystal layer formed in the inner space between the first or second substrate; 
 wherein the gap has a value in a periphery of the display area and a value at a center of the display area, where the values have a difference within a limit for causing no interference fringe.  
   
     
     
         23 . The panel according to  claim 22 , further comprising a second sealing member in the gap between the first and second substrates; 
 wherein the second sealing member has a second closed pattern surrounding the first sealing member;    and wherein the first sealing member is used for sealing the liquid crystal.    
     
     
         24 . The panel according to  claim 23 , wherein the first sealing member is made of a thermosetting resin.  
     
     
         25 . The panel according to  claim 23 , wherein the first sealing member is made of a thermosetting resin and the second sealing member is made of a UV curing resin.  
     
     
         26 . A LCD panel comprising: 
 (a) a first transparent substrate;    (b) a second transparent substrate coupled with the first substrate to form a gap between the first and second substrates; 
 a closed inner space being formed between the first and second substrates by a first sealing member;  
 the first sealing member being formed to surround a display area;  
 the first sealing member being made of a thermosetting resin;  
 the first sealing member having a first closed pattern; and  
   (c) a liquid crystal layer formed in the inner space between the first or second substrate; 
 wherein the gap has a value in a periphery of the display area and a value at a center of the display area, where the values have a difference with in a limit for causing no interference fringe.  
   
     
     
         27 . The panel according to  claim 26 , further comprising a second sealing member in the gap between the first and second substrates; 
 wherein the second sealing member has a second closed pattern surrounding the first sealing member;    and wherein the first sealing member is used for sealing the liquid crystal.