Patent ID: 7361610

Claim:
A method of etching a glass substrate for a display device, comprising: mixing deionized water and a undiluted etchant to form a glass etchant; heating the glass etchant to a temperature greater than room temperature before providing the glass etchant in an etching bath; providing the heated glass etchant in an etching bath; providing a display panel having a glass substrate in the etching bath provided with the heated glass etchant for etching the glass substrate; measuring a temperature of the etching bath; stopping the etching of the glass substrate on a basis of the measured temperature; refining the glass etchant provided the etching bath; storing the refined glass etchant in a storage tank; further refining the refined glass etchant provided from the storage tank; and mixing the refined glass etchant with the deionized water and the undiluted etchant and forming the glass etchant.