The product CS14900F190P-C111 uses ten-point capacitive touch.
Capacitive touch is very sensitive to power noise. Ripple voltage/current from the power adapter will cause the LCD ripples, and will also cause the capacitive touch malfunction: If you use the APK Multi-Touch under Android to test, you can find the touch point float. There are several ways to solve this problem:
1) Use a high quality power adapter. Or use battery to provide the power like cell phone or tablet PC.
2) If user power adapter isn’t good enough, there’s another effective method to solve this problem: Make sure the CS14900F190P-C111 power input connector Pin 3 really connect to user “Power System Ground”. This method can eliminate the problem totally. The user can also use another method to test this problem: touch the GND of CS14900F190P-C111 by one hand, the other hand operates on the capacitive touch screen. In this case, the user’s body acts as the Power System Ground.