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Noise issues with long cables and LCD display

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mindthomas

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Hi all fellow electronics engineers.
We are currently working on a two-display ARM processor solution and have finished our PCB but seems to be having some issues with the cabling.
Our current configuration consists of a single SSD1963 LCD display connected by a 1 meter long 40-pin flat ribbon cable.

The display doesn't work being connected with the long 1 meter wire. Though it works perfectly fine if the cable is reduced to 30 cm.
Though the wierd thing is that the display starts to work with the 1 meter cable if I hold my finger across all the terminals?

Please see the video below and hopefully you might have a solution.

Best regards
Thomas Jespersen
 

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