Question Colour schemes in Japanese signs/banners.

I know this is might sound a silly question and apologise in advance if it can't be answered.

I know everybody is familiar with the red lanterns in Japanese restaurants and the BladeRunner type colourful neon lit cityscapes is a cliche of Hollywood sci-fi flics but I have noticed that in a lot of clips of contemporary Japan where signs/billboards and banners have a distinct colour scheme that is striking and not really seen in the West. I've done a search on both Bing and Google image search and hopefully they appear when I post this topic to highlight what I mean.






I'm aware of the concept of Kawaii in Japanese artistic culture as a way to express cuteness but is this similar or is there any history or reason for the above colour schemes in banners and sings or is it just simply a way to make them look visually striking?