Method for manufacturing capacitive touch screen

Abstract

The invention relates to a capacitive touch screen used on electronic equipment, in particular to a method for manufacturing the capacitive touch screen. The method mainly comprises the following steps of: cutting large glass into small pieces; performing computer numerical control (CNC) machining; making charged coupled device (CCD) positioning marks on the upper surface of a large transparent substrate in an array mode according to the size of product glass, and dispensing an ultraviolet (UV) adhesive in the position range of each CCD positioning mark; performing chemical strengthening to form the product glass; accurately superposing the product glass to the CCD positioning marks of the large transparent substrate, adhering and curing; plating an indium tin oxide (ITO) film on each piece of product glass, and photoetching; plating a metal film, and photoetching; attaching to a flexible printed circuit board (FPC); and separating the product glass from the large transparent substrate. By the method, a module which consists of two glass substrate products in the prior art is formed by one piece of product glass, so that the defects in the prior art can be overcome, machining efficiency is effectively improved, yield is high, and production cost is reduced.

Description

technical field [0001] The invention relates to a manufacturing method of a touch screen in an electronic product. Background technique [0002] With the rapid development of science and technology, touch screens are widely used in electronic products such as mobile phones, palmtop computers, car navigation devices, and notebook computers. There are two existing leading production technologies for capacitive touch screens. One is the large sheet glass route. Glue cleaning—cutting into small pieces—CNC molding—AFCoating—FPC bonding—testing—inspection and packaging. This process, as disclosed in Chinese patent 200980138382.1, is to first make an array of touch sensor units on a large sheet of strengthened glass (completed by the above-mentioned ITO coating-cleaning-gluing-photolithographic molding), and then cut according to the sensor unit Into a small unit, its advantage is high production efficiency. However, it has brought two defects: one is that the strengthening proc...

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Problems solved by technology

However, it has brought two defects: one is that the strengthening process can only strengthen the surface of a large piece of glass. After cutting into small pieces, the cutting surface of each small piece is not strengthened, which reduces the anti-drop performance; In the subsequent CNC forming process, such as opening, chamfering, and chamfering, it is easy to damage the printed circuit in the touch sensor unit and cause scrap

The advantage is that each small piece is fully strengthened, has strong drop resistance, and is easy to form by CNC. However, it is necessary to print patterns, coat ITO films, and photolithography processes on each small piece to form the printed circuit of the touch sensor. , low production efficiency

In addition, the existing touch screen module is composed of two products: a window protection screen (strengthened glass substrate) and a touch screen (non-strengthened glass substrate). The double glass structure leads to increased thickness, volume, and cost.

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