Curing resin composition and sealants and end-sealing materials for displays

#The invention relates to a curing resin composition which scarcely causes pollution of a liquid crystal owing to elution of its components to the liquid crystal material and therefore, causes little unevenness of color in liquid crystal display in the case of using it as a sealant for a liquid crystal display element or an end-sealing material for a liquid crystal display element in fabrication of a liquid crystal display element and that is excellent in the storage stability and therefore, optimum for fabrication of a display apparatus especially by one drop fill process and relates to a sealant for a display element and an end-sealing material for a display element using the composition.

#Conventionally, a liquid crystal display element such as a liquid crystal display cell is fabricated by setting two electrode-bearing transparent substrates face to face at a prescribed distance, forming a cell by sealing their surrounding with a sealant, injecting a liquid crystal into the cell through a liquid crystal injection inlet formed in a portion of the cell, and sealing the liquid crystal injection inlet by the sealant or an end-sealing material.

#In this method, at first, a seal pattern having a liquid crystal injection inlet is formed on one of the two electrode-bearing transparent substrates by screen printing using a thermosetting sealant and then the solvent in the sealant is dried by pre-baking at 60 to 100° C. Next, the two substrates are set face to face while sandwiching a spacer between them, aligned, stuck to each other, and thermally-pressed at 110 to 220° C. for 10 to 90 minutes, and after the gap adjustment in the vicinity of the sealant, the sealant is partly cured by heating at 110 to 220° C. for 10 to 120 minutes in an oven. After that, a liquid crystal is injected through the liquid crystal injection inlet and finally the liquid crystal injection inlet is sealed by an end-sealing material to fabricate a liquid crystal display element.

#FIG. 1 is a schematic figure illustrating the formation of a light emitting display layer in an organic EL display fabrication.

#FIG. 2 is a schematic figure illustrating the formation of an organic light emitting layer in an organic EL display fabrication.

#FIG. 3 is a schematic figure illustrating the structure of organic EL display.

#Hereinafter, the invention will be described in details.

#A curing resin composition of the first invention is to be used for a sealant or an end-sealing material for a display element and contains a curing resin together with a photopolymerization initiator and/or a curing agent and has the following characteristics after curing. Owing to such characteristics, the curing resin composition of the invention used as a sealant or an end-sealing material for a liquid crystal display element exhibits excellent adhesion property to a substrate and neither pollutes a liquid crystal owing to elution of its components in the liquid crystal nor causes orientation disorder of the liquid crystal and decrease of the voltage holding ratio with the lapse of time.

#That is, the curing resin composition of the first invention has 3 to 10% by atom as a ratio of nitrogen atoms in the total of the carbon atoms, hydrogen atoms, and nitrogen atoms in the case where element analysis is carried out after curing. When the ratio is less than 3% by atom, the adhesion property to a substrate is inferior in the case of using the composition as a sealant or an end-sealing material and when it is more than 10% by atom, humidity resistance is inferior.