Samsung Display Co., Ltd.

Dongwoo Fine-chem Co., Ltd.

Youngjin Yoon

Beomsoo Kim

Giyong Nam

Kitae Kim

Jong-Hyun Choung

Yujin Kim

Hongsick Park

Seon-Il Kim

In-Bae Kim

Jonghee Park

Jinseock Kim

Jeehoon Kim

Shinhyuk Yang

Donghan Kang

Daesung Lim

Youngchul Park

Kyungbo Shim

Inseol Kuk

Inho Yu

Sangtae Kim

Suckjun Lee

Hyeonsu Cho

Eunwon Lee

An etchant including: persulfate; a fluorine-containing compound; a chlorine-containing compound; a cyclic amine compound; an inorganic acid; sulfate; and water, wherein a tip control index (Y) of the etchant is a value of at least about 45.0 and not more than about 70.0, the tip control index (Y) being a value calculated by Equation 1:=1.0×10(1)+1.0×10(2)+5.0×10(3)+1.5×(1)×(2)+2.0×10(1)×(3)+2.0×10(2)×(3)  Equation 1The description of Equation 1 is as in the specification.

Etchant

An etchant includes: based on a total weight of the etchant, about 1 wt % to about 15 wt % of sulfurized peroxide, about 5 wt % to about 10 wt % of nitric acid, about 20 wt % to about 40 wt % of organic acid, about 0.05 wt % to about 5 wt % of ferric nitrate, about 0.1 wt % to about 5 wt % of ionic sequestrant, and 0.1 wt % to 5 wt % of corrosion inhibitor, wherein a remaining amount is deionized water.

Etchant and method of manufacturing display device by using the same

An etchant includes, based on a total amount of the etchant, from about 0.5 to about 20 wt % of a persulfate, from about 0.01 to about 2 wt % of a fluorine compound, from about 1 to about 10 wt % of an inorganic acid, from about 0.5 to about 5 wt % of an azole compound, from about 0.1 to about 5 wt % of an electron-donating compound, from about 0.1 to about 5 wt % of a chlorine compound, from about 0.05 to about 3 wt % of a copper salt, from about 0.1 to about 10 wt % of an organic acid or an organic acid salt, and a remaining amount of water.

Etchant and method for manufacturing display device using the same

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Iksan-si, South Korea

Youngjin Yoon