Capacitive touch screen and circuit lead-out method therefor

Abstract

The invention relates to a touch screen, in particular to a capacitive touch screen and a circuit lead-out method therefor. An FPC (Flexible Printed Circuit) is directly hot-pressed on a panel substrate with a transparent conductive coating by adopting the hot-press technology, and a sensor circuit used for detecting the touch position and formed on the transparent conductive coating printed in a window is connected with a circuit on the FPC through a bridging circuit formed in the way that the transparent conductive coating extends to the back side of the frame of the window, and is also connected with a touch-control IC (Integrated Circuit) through the circuit of the FPC. According to the invention, the connection process of the FPC and the sensor circuit on the panel substrate is simplified, and the binding process of the FPC and the touch screen is also simplified, so that structural simplification of the touch screen is achieved, the processing procedure is more convenient and the whole screen is thinner.

Description

technical field [0001] The invention relates to a touch screen, in particular to a method for leading out lines of a capacitive touch screen and the capacitive touch screen. Background technique [0002] Capacitive multi-touch screens can be used in touch-screen mobile phones, touch-screen PDAs, tablet computers, car navigators and industrial control equipment, and can realize multi-touch and gesture operations. [0003] At present, the flexible circuit board (FPC) of the projected capacitive touch screen that is common on the market is hot-pressed on the functional sheet (SENSOR). The material of the SENSOR can be indium tin oxide film (ITO FILM) or indium tin oxide glass (ITO GLASS). Hot pressing method such as figure 1 As shown, 101 is FPC, which is used to connect the bottom SENSOR and the connecting line of the main board; 102 is the top panel, made of GLASS or PET, which is the cover of the touch screen, and the contact surface touched by the user has no circuit; 103 ...

AI Technical Summary

Problems solved by technology

However, the lamination process of the top panel made of GLASS and the bottom sensor is complicated, requiring high-end equipment and laminating materials, which affects production efficiency and production capacity. Because of the high cost and complicated process of the GLASS panel, the price of the processed capacitive touch screen is also quite high.

The top panel made of PET is low in cost, easy to process and assemble, high in production yield, and convenient for high-capacity production, but it is slightly inferior in appearance, touch texture and surface scratch resistance hardness

[0005] In addition, the top panel is bonded to the bottom sensor by optical glue, and the structure of the bottom sensor heat-pressed FPC leads to a complex structure of the capacitive touch screen, and the bridging lines of the top panel are generally realized on the FPC

In this way, the FPC needs to have a large design space, which greatly restricts the structure of the terminal machine, and there are too many pins when the FPC and the top panel are connected, which greatly affects the connection process between the top panel and the FPC, thus affecting Production efficiency and yield of touch screen

In addition, such a connection method has relatively high requirements on the production of FPC, which restricts the production efficiency and yield of FPC.

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