Hard coating film and touch panel using the same

Abstract

The purpose of the invention is to provide a hard coating film and a touch panel using the same. The hard coating film of the invention comprises a transparent basis material layer which uses polycarbonate resin as main ingredient and a hard coating layer which is bonded on one side of one surface of the transparent basis material layer. The average thickness of the transparent basis material layer is more than 5 [mu] m but less than 50 [mu] m. Preferably, the photoelastic coefficient of the basis material layer is under 40*10-12/Pa. In addition, preferably, hard coating layer also comprises a bonding layer which is bonded on the other surface of the basis material layer. Preferably, the main ingredient of the adhesives constituting the bonding layer is acrylic resin adhesives. Preferably, the haze degree of the hard coating film is less than 2% and the light transmissivity of the hard coating film is over 87%.

Description

technical field [0001] The present invention relates to a hard coat film suitable for a liquid crystal display device and a touch panel using the same. Background technique [0002] Liquid crystal display modules (LCD) are mostly used as flat panel displays due to their thinness, lightness, and low power consumption. This use is expanding year by year as information display devices such as mobile phones, personal digital assistants (PDA), personal computers, and televisions. In recent years, as the characteristics required for liquid crystal display modules, various characteristics are required depending on the application, and examples include brightness (higher brightness), easy viewing (wider viewing angle), energy saving, and thinner and lighter weight. , large screen, etc. [0003] As the above-mentioned liquid crystal display module, there is also a liquid crystal display module equipped with a touch panel, which is used to improve the ease and speed of operation by t...

AI Technical Summary

Problems solved by technology

[0005] However, the above-mentioned touch panel has the following problems: when the viewer presses the glass substrate strongly or when the touch panel is dropped, the glass substrate etc. are damaged and fragments of the glass substrate are scattered.

However, the strength of the PET film is not enough. If it is necessary to maintain sufficient strength against various impacts on the touch panel, the thickness must be increased, which violates the requirements for thinning.

In addition, PET film has a high retardation value (Re), and a retardation due to birefringence

Therefore, when viewing polarized light emitted from a liquid crystal panel such as a so-called 3D image, there is a problem that the image is unclear due to optical interference patterns generated by changes in the phase difference.

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