Liquid crystal display panel

Abstract

The present invention relates to a liquid crystal display panel having a predetermined size, containing a wiring film formed of a metal, an insulating film containing an inorganic substance and a substrate formed of a non-alkali glass, in which the metal has the product of a Young's modulus (E) and a thermal expansion coefficient (α) at room temperature falling within a predetermined range, α of the inorganic substance is smaller than that of the non-alkali glass, the non-alkali glass has E of from 70 GPa to 95 GPa and a of from 32×10−7 to 45×10−7 (1/° C.) in which E and α satisfies a predetermined formula, and has a predetermined composition.

1 . An active matrix drive-type liquid crystal display panel, comprising:
 a substrate of a non-alkali glass;   a wiring film comprising a metal formed on at least one surface of the substrate of the non-alkali glass; and   an insulating film comprising an inorganic substance formed on a surface of the wiring film,   wherein   the wiring film has a thickness of 0.1 μm or larger,   the insulating film has a thickness of 100 nm or larger,   the substrate has a long side of 1,800 mm or larger, a short side of 1,500 mm or larger, and a thickness of 0.5 mm or smaller,   the metal has the product of a Young's modulus and a thermal expansion coefficient at room temperature of from 10,000×10 −7  GPa/° C. to 25,000×10 −7  GPa/° C.,   the inorganic substance of the insulating film has an average coefficient of thermal expansion at a temperature of 50° C. to 350° C. smaller than that of the non-alkali glass,   the non-alkali glass has a Young's modulus (E) of from 70 GPa to 95 GPa and an average coefficient of thermal expansion α at a temperature of 50° C. to 350° C. of from 32×10 −7  to 45×10 −7 /° C.,   the Young's modulus E and the average coefficient of thermal expansion α of the non-alkali glass satisfy formula (1):
   20α+7 E≥ 1310  (1)
 
   wherein a unit of α is 10 −7 /° C. and a unit of E is GPa, and   the non-alkali glass comprises, in terms of mol % on the basis of oxides:   SiO 2  66 to 74,   Al 2 O 3  10 to 15,   B 2 O 3  0.1 to 2.5,   MgO 2 to 12,   CaO 3 to 11,   SrO 0 to 10,   BaO 1 to 5, and   ZrO 2  0 to 2,   wherein MgO/(MgOH+SrO) is 0.69 or more.   
     
     
         2 . The liquid crystal display panel according to  claim 1 ,
 wherein the non-alkali glass has a composition in terms of mol % on the basis of oxides, satisfying the relationship of: 759−13.1×SiO 2 −7.5×Al 2 O 3 −15.5×B 2 O 3 +9.7×MgO+21.8×CaO+27.2×SrO+27.9×BaO≥0.   
     
     
         3 . The liquid crystal display panel according to  claim 1 ,
 wherein the metal is selected from the group consisting of copper, aluminum and molybdenum.   
     
     
         4 . The liquid crystal display panel according to  claim 1 ,
 wherein the inorganic substance is selected from the group consisting of silicon nitride, silicon oxide and silicon oxynitride.   
     
     
         5 . The liquid crystal display panel according to  claim 1 , which is obtained at a maximum temperature of 450° C. or lower. 
     
     
         6 . A substrate formed of a non-alkali glass used in the liquid crystal display panel described in  claim 1 .