Photo-curable resin composition, prism sheet, backlight unit and liquid crystal display device

Abstract

The invention provides a photo-curable resin composition, a prism sheet, a back light unit and a liquid crystal display device. The photo-curable resin composition contains (methyl) acrylate oligomer (A), (methyl) acrylic ester monomer (B) and light initiator (C) represented by the following chemical formula 1 and chemical formula 2. In the chemical formula 1, X is oxygen, sulfur, sulphone group, methylene, ethyl or isopropyl, Y is hydrogen or methyl independently, n and m are independently an integer greater than 1, and 5 < = n + m < = 15. In the chemical formula 2, X is oxygen, sulfur, sulfonyl, sub-methyl, ethyl or isopropyl and Y is hydrogen or methyl independently. The photo-curable resin composition has a good refractive index and an excellent elasticity, which is high in reliability at a low viscosity. Therefore, the photo-curable resin composition can be used for manufacturing a prism sheet and the prism sheet can be used for a backlight unit and a liquid crystal display device.

Description

technical field [0001] The invention relates to a photocurable resin composition, a prism sheet made from the composition, a backlight unit and a liquid crystal display device. Background technique [0002] The prism sheet can be used to increase the brightness of a backlight unit mounted on the back of a liquid crystal display (LCD), and thus various attempts have been made on the prism sheet in order to increase the brightness of the backlight unit. [0003] The light flow of the backlight unit can be properly utilized to increase the brightness of the backlight unit. At this time, a thin sheet made with a special three-dimensional structure is used to increase the front brightness of the light source device. The three-dimensional structure is formed with a certain pattern on at least one side of the sheet as a prism layer. [0004] As a general light source used in the backlight unit, there are cold cathode fluorescent lamps (CCFL) or light emitting diodes (LED). Since...

AI Technical Summary

Problems solved by technology

[0005] When using a general UV-curable resin for the coating of a backlight prism sheet, a polyurethane-based resin that improves elasticity is used to improve handling characteristics, but in this case, the refractive index decreases and the brightness decreases, so there is a problem with liquid crystal display elements. Image darkening and quality loss issues

In addition, in order to increase the refractive index of UV-curable resins, halogenated, especially brominated substances can also be used, but this will cause environmental problems, and it contains harmful components to the human body, so there are many demands for improvement.

In recent years, reports have introduced photocurable high-refractive index materials containing polycyclic aryl groups, acryl groups, or heteroaryl groups, but these materials have slow curing speed, low elasticity, rapid yellowing after curing, and are difficult to apply. Disadvantages like

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