Patent 10116124 was granted and assigned to LG on October, 2018 by the United States Patent and Trademark Office.
The present invention comprises: a plastic plate; a copper discharge electrode formed on a first surface of the plastic plate, the copper discharge electrode having at least one discharge needle; a ground electrode formed on an opposite surface of the plastic plate; and a metal coating layer coated on the copper discharge electrode. Thus, reduced manufacturing costs and maximized lifespan are possible.