keep an eye open for picture viewers. Ive used the 1.5" ones for thumb print and eye scanners before. Not all of them will display an animated gif and even more are not able to adjust the alternating display times. I had to order them from China off ebay that were adjustable from .5 seconds and up to appear to be a moving display when scanning.
Picture viewers are self contained where a monitor is just a display alone and needs something to input the graphic.
Try also searching for a digital picture frame. They come is various sizes and many are self contained now a days.