Method for chemically plating gold on surface of capacitive touch screen

Abstract

The invention relates to the technical field of plating gold on the surface of a capacitive touch screen, in particular to a method for chemically plating gold on the surface of the capacitive touch screen. The method has the advantages of enhancing the practical utilization ratio of indium tin oxide (ITO) glass, saving the liquid gold and lowering cost. The method is characterized by comprising the following steps of: sputtering ITO on the surface of a glass substrate of the capacitive touch screen to form double-sided ITO glass; partitioning a visible region and a surrounding region of touch control glass on the double-sided ITO glass according to composition; etching a sensor inductance electrode in the visible region and a trace in the surrounding region of the touch control glass by using a photograph process; printing a gold-plated protective film on the visible region of the touch control glass; and plating gold on the trace of the touch control glass by using a chemical nickel plating process and chemical gold plating process, wherein the gold-plated protective film is a strong acid-resistant and high temperature-resistant protective film to which Ni and Au metal particles cannot be attached.

Description

technical field [0001] The invention relates to the technical field of gold plating on the surface of a capacitive touch screen, in particular to a method for performing chemical gold plating on the surface of a capacitive touch screen. Background technique [0002] In order to meet the limitation of the chip on the input impedance of the loop, it is necessary to reduce the impedance of the edge traces of the capacitive touch screen. A metal film with good conductivity can be formed on the edge traces by electroless gold plating. [0003] The existing capacitive touch screen is gold-plated by electroplating. Since it generally includes many small pieces of touch glass on the large piece of ITO glass, it is necessary to reserve a conductive area around the large piece of ITO glass to form electrodes during electroplating. At the same time, the single small piece of touch glass also needs to form a circuit with the conductive area separately. It is necessary to leave enough ga...

AI Technical Summary

Problems solved by technology

[0003] The existing capacitive touch screen is gold-plated by electroplating. Since it generally includes many small pieces of touch glass on the large piece of ITO glass, it is necessary to reserve a conductive area around the large piece of ITO glass to form electrodes during electroplating. At the same time, the single small piece of touch glass also needs to form a circuit with the conductive area separately. It is necessary to leave enough gaps between each single small piece of touch glass to ensure the stroke of the circuit, and then form a metal film on the ITO glass through electroplating. Because of the existence of the conductive area, the actual utilization rate of large pieces of ITO glass is reduced. At the same time, a metal layer will be formed on the conductive area, which increases the amount of gold plating solution and increases the cost.