Sorry I definitely should have been more clear on the actual size of the panel, I meant 64X64 pixels around 160mm this method of using pixels as a type of measurement I presumed to be a normal way of describing a panel. I do however think that a panel would be better for my use as due to it being outdoors it needs to be as bright and clear to see as possible as people going past will be going past at around 60mph.
If I do use the dot matrix pannel do you have any recommendations for being able to use buttons as it’s contol method, bearing in mind their would only need to be 4 buttons needed to select these colors.