It does not appear the Polaroid is actually 1920 x 1080.
The specs match neither of the two 1080p panels detailed above, the manual says it ain't, the availability says it ain't, etc.
I may try to see it later today if I can.
There is no difference in HDMI cables. If you can see the picture without visible dropouts or sparklies, the cable is working at 100%. No other cable will display a better version of that picture. You're simply wrong if you think there is a better digital cable than one that is already working.