US 12,461,622 B2
Test methods for capacitive touch screens, and capacitive touch screen assemblies
Sebastian Raschbacher, Meinheim (DE); and Hubert Martin Bode, Haar (DE)
Assigned to NXP B.V., Eindhoven (NL)
Filed by NXP B.V., Eindhoven (NL)
Filed on May 28, 2024, as Appl. No. 18/675,524.
Claims priority of application No. 23176843 (EP), filed on Jun. 1, 2023.
Prior Publication US 2024/0402845 A1, Dec. 5, 2024
Int. Cl. G06F 3/041 (2006.01); G06F 3/044 (2006.01)
CPC G06F 3/0416 (2013.01) [G06F 3/0446 (2019.05)] 20 Claims
OG exemplary drawing
 
1. A method of testing a capacitive touch screen, during the operation of which a drive signal is applied to a respective line of a first plurality of lines, each drive signal being unique, and each of a second plurality of lines is responsive to each of the drive signals, wherein a change in a response on a one of the second plurality of lines to a one of the drive signals on one of the first plurality of lines is indicative of a touch event at a cross-point of the one of the first plurality of lines with the one of the second plurality of lines, the method comprising:
modifying an amplitude of a respective drive signal applied to each of the first plurality of lines; and
in the event of identifying a response to each modified amplitude, on each of the second plurality of lines,
determining that the touch screen does not have a fault,
and otherwise determining that the touch screen has a fault.