This logo was only seen on the first teaser trailer in the spring of 1989.
This was the first logo, which was seen on the movie posters for the original 1989 theatrical release and the original 1990 VHS release. It is still seen in the opening credits, especially in subsequent releases of the film.
In 1997, starting with the 1997 theatrical re-release the logo has been updated for the first time and has since been the main logo for future releases of Little Mermaid media and merchandising.
The Little Mermaid 3D (2013)
The Little Mermaid Second Screen Live