bad images on LCD screen

Hi,
We are desperate with the bad images on the LCD screen of the UEZGUI-1788-56VI-BA and we need your HELP. The bad images occur sometimes when the LCD screen is turned on.

We have 4 such LCD screens used in our production units and the problem can be found sometimes on all of the 4 LCD screens.

Attached (Untitled1.png, 1.PNG) are captured bad images. The last picture ((Capture.PNG) is the correct picture.

Thanks,
Derong Yuan
Electronics Engineer
Tyne Engineering Inc
phone: 1-289-288-0490 ext 229