It may be inappropriate... yet I did a quick search with 陳列 and 展示 on Google images, and got a faint idea about 陳列 and 展示.
陳列 is to display goods for sales (for example, the items in a shop, a supermarket or a showroom).
展示 is to gather and display all the goods (in a trade fair) or art works (in a museum); and sale is not the main purpose, yet the goods/works can be bought (it depends).
I just have interested in your question, state my idea about it and this is not an assure answer, anyway. I am waiting to be corrected by masaegu, too
