The PixelsPerXLogicalInch property indicates the number of pixels per logical inch along the X axis (horizontal direction) ...

The PixelsPerXLogicalInch property indicates the number of pixels per logical inch along the X axis (horizontal direction) of the display.  
This property has been deprecated in favor of a corresponding property(s) contained in the Win32_VideoController, Win32_DesktopMonitor and//or CIM_VideoControllerResolution