Method for detecting shielding layer of capacitive touch screen

Abstract

The invention relates to a method for detecting a shielding layer of a capacitive touch screen. By use of a test computer with capacitive touch screen test software, a functional test board and a functional test adapter board, an FPC (Flexible Printed Circuit) shielding pin is simulated by a conductive material, so that the test of the shielding layer of a to-be-detected touch screen is achieved; the functional test board comprises a singlechip; the functional test adapter board is made of a bi-layer printed circuit board and used for line adaption; the functional test board is connected with the test computer by a USB (Universal Serial Bus) data line; the functional test board is connected with the functional test adapter board by a flat cable; the functional test adapter board is connected with the FPC of the to-be-detected touch screen by a ZIF (Zero Insertion Force) or BTB (Board To Board) connector; and the functional test adapter board is connected with the conductive material for simulating the FPC shielding pin by a flexible cable. The shielding pin of the flexible printed circuit board is stimulated by the conductive material for the test, so that the secondary damage of the FPC board in the detection process is avoided; and the method has high detection accuracy and efficiency, and strong operability.

Description

technical field [0001] The invention relates to a capacitive touch screen detection method, in particular to a capacitive touch screen sensor shielding layer detection method. Applicable to the case where the touch screen shielding layer is full-surface ITO (Indium Tin Metal Oxide). Background technique [0002] With the wide application of touch screens in technology, business, and daily life in recent years, the number of touch screen manufacturers is increasing, the competition is becoming more and more fierce, and the price of touch screens is constantly falling. In this form, if touch screen manufacturers want to increase their profits, their manufacturing yield must be improved, and an important factor related to the yield is the shielding layer of the touch screen. [0003] At present, for the detection method of capacitive touch screen shielding layer, it is usually to remove the FPC (flexible circuit board) shielding feet that have been bonded (hot pre...

AI Technical Summary

Problems solved by technology

[0003] At present, for the detection method of capacitive touch screen shielding layer, it is usually to remove the FPC (flexible circuit board) shielding feet that have been bonded (hot pressed), and then perform secondary Bonding (hot pressed), and then software function test, to Confirm whether it is the shielding layer problem; this method can confirm the shielding layer problem of the touch screen to a certain extent, but it also has shortcomings. In the process of removing the FPC shielding feet, tools such as heating tables and blades will be used. FPC (Flexible circuit board) shielding feet will be damaged to a certain extent, which will affect the secondary Bonding (hot pressing), if the secondary Bonding (hot pressing) technology is not good, it will lead to inaccurate functional test results

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