公开(公告)号：US10528189B2

公开(公告)日：2020-01-07

申请号：US15948147

申请日：2018-04-09

Applicant: STMicroelectronics Design and Application S.R.O.

Inventor： Milan Andrle ,  Martin Havlasek ,  Martin Fucik

IPC: G06F3/041 ,  G06F3/044

Abstract: Disclosed is a method for testing touch screen displays during manufacture. A touch screen controller (TSC) is packaged, and the analog channels of the TSC are characterized, with resulting data being stored for later use. The TSC is programmed, and the touch screen display and TSC are packaged together. The touch screen display is tested using firmware in the TSC, enabling calculation of the inherent capacitances between force and sense lines of the touch screen display when connected to the TSC during operation. The testing involves, for each force and sense line pair, measuring an output signal generated by a receive channel of the TSC coupled to the sense line of that pair. Based upon the data gathered during characterization, and the signals measured during testing, the capacity of the touch screen display is then calculated.