In the 1980s the appearance of VCRs lead to the growth of Mobile Cinemas. These were small operations which would travel from one small village to the next and set up temporary cinemas. They would set up televisions, often powering them with mobile generators, and screen films.
To advertise their show they hired artists to paint posters for their films. You can see more of them, as well as buy one if you want to, at ghanamovieposter.com. The book Extreme Canvas: Movie Poster Paintings from Ghana is also available which has many more examples.