Optical film and preparation method thereof and flexible cover plate

Abstract

The invention provides an optical film, which is characterized in that the optical film is provided with a first surface and a second surface which are oppositely arranged, the surface roughness Ra of the first surface or the second surface is smaller than or equal to 0.5 micrometer, a hardened base material layer is arranged between the first surface and the second surface, and the hardened base material layer comprises the following components in percentage by mass: 15-70% of nano inorganic particles, and 30-85% of a transparent organic resin. The optical film has good surface hardness, friction resistance, UV resistance and bending performance, and can meet the requirements of flexible display equipment.

Description

technical field [0001] The present application relates to the display field, in particular to an optical film used as a flexible cover and a preparation method thereof. Background technique [0002] Cover glass (Cover Lens or Cover Glass), also known as strengthened optical glass, glass window, etc. The main raw material of the product is ultra-thin flat glass. After cutting, CNC engraving, thinning, cleaning inspection, strengthening, coating, silk screen and other processes, it has impact resistance, scratch resistance, oil resistance, fingerprint resistance, and enhanced light transmission. rate and other functions. Since the cover glass is in direct contact with the outside world, in addition to the surface finish, thickness and other parameters, properties such as high hardness, compression resistance, and scratch resistance determine the quality of the cover glass. After the cover glass is attached to the outer layer of the touch screen, it can protect the touch scre...

AI Technical Summary

Problems solved by technology

Ordinary glass cover plates are brittle and cannot be bent, which does not conform to the development trend of foldable display devices. Although resins can be bent, the common problem of these resin films represented by PET, TAC, and PC is that they have low hardness and are easy to scratch. Therefore, when used in the display industry, it is necessary to add a coating layer to change the surface composition and hardness to avoid the above problems; at the same time, the mechanical strength of the above film materials is poor, and it is easy to break during the use of flexible screens.

[0004] The flexible cover is currently used in the industry to replace the flexible cover with CPI film. However, after repeated bending of the CPI film, some creases will appear, which affects the user experience. In terms of material performance, although CPI has the characteristics of softness and good bendability, However, it is poor in wear resistance, light transmittance, surface texture and sealing

On the other hand, ultra-thin glass (Ultra-thin Glass, UTG) has begun to be introduced in flexible screens. UTG ultra-thin glass technology uses glass raw materials from Schott, a German glass manufacturer. UTG has a high surface hardness and will not appear after repeated use. Creases, but its cutting and forming process is relatively difficult, and it is difficult to improve the yield rate of UTG glass cutting. At the same time, compared with film materials, it is easy to break during the drop test

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