Originally Posted by Brian B-P
You could use a laptop to play the movie, displaying it on the TV through an HDMI cable. If you put the movies on microSD cards, and use a tablet or phone that has a microSD slot (that is, presumably not anything from Apple), you could play the movies on the tablet/phone and display it on the TV through an HDMI cable. An alternative to an HDMI cable is a Chromecast or similar device that accepts the video from the computer/phone/tablet over WiFi and puts it into an HDMI port on the TV.
All of this assume that the TV has an HDMI port - it's hard to imagine a TV built today that wouldn't have at least one.
The Apple TV device (even the older generations that are fairly inexpensive) has an HDMI output. Most apple devices (iPads, iPods, iPhones, laptops, etc) can connect to the Apple TV using WiFi. I use one to display photographs from my laptop to the TV.