In terms of prototypes for displaying, the tools you utilize to demonstrate your invention will depend on your budget for prototypes, and the complexity of the invention itself. For example, some products could be displayed using enlarged photographs or story boards. An even stronger presentation might use a multimedia display with computer generated graphics projected onto a large TV screen. This can be done fairly reasonably because you can buy the software and in addition to being cost-effective, is easy to use. Or a professional video can also be shown on a large TV screen.
Many people believe that the show is an end in itself.
They're expecting someone to come along and see the brilliance of their million dollar idea and write them a check on the spot. This is far from true for any trade show. Any trade show is only a part on the path of the inventing and marketing process, but it can be an important part. Trade shows should be places to generate qualified leads, make industry contacts, meet inventor peers, establish life-long contacts both business and social. The trade show concept roots date back to biblical times when bazaars were where merchants showed and sold their wares.