PanelDue Failure
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Just tested it, touching the vias on the backside of the LCD's PCB, right before the flat ribbon connector connected to the LCD itself, makes shimmer go away.
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I've noticed that some 4.3 and 5 inch displays have black shielding over part of the ribbon cable. But I've never seen this on a 7 inch display. Maybe an insulated shield over the ribbon cable, or over part of the display panel, would fix it. I can't test this because both my 7 inch displays work perfectly.
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Mayby Tony can test it
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I'm seeing the same "ripple" effect with a brand-new 7" display ordered from "here", and I can confirm that touching the back side of the display PCB or the connector temporarily resolves the effect. Since I don't want to make my fingertip a permanent part of my 3D printer, what material would be suitable to add the shielding, grounding or whatever other effect is required?
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The two 7" displays I have don't have this problem, so I don't know what works. You could try putting a piece of aluminium foil on top of the wide Kapton ribbon cable that connects the TFT panel to the PCB, and putting sticky tape over that to hold it in place and make sure it can't short against anything.
