SWITCHABLE PRIVACY FILTER USING ELECTROCHROMIC MATERIAL AND PREPARATION METHOD THEREOF

摘要

The present invention relates to a privacy filter and its preparation method and, more particularly to a privacy filter and its preparation method in which the privacy filter comprises: a first transparent substrate; a second transparent substrate positioned a predetermined distance apart from and opposite to the first transparent substrate; an electrolyte filled between the first and second transparent substrates; and a second transparent conductive layer disposed between the electrolyte and the second transparent substrate. The first transparent substrate comprises: an uneven pattern having a wire grid and trenches formed on the first transparent substrate; a first transparent conductive layer formed on the wire grid and the trenches of the uneven pattern; and an electrochromic layer being formed on the first transparent conductive layer along the sidewall of the wire grid and containing an electrochromic material to transmit or absorb visible light depending on whether an electrical signal is applied or not. The privacy filter of the present invention can effectively block the lateral transmission of light without a loss of the front transmittance in the private mode, achieve a fast switching between wide field mode and narrow field mode, and secure excellences in filter performance and driving stability.