Digital display and Liquid crystal display

Digital display noun - A display that gives the information in the form of characters (numbers or letters).

Liquid crystal display and digital display are semantically related. In some cases you can replace phrase "Liquid crystal display" with "Digital display", this phrases are similar.

Liquid crystal display noun - A digital display that uses liquid crystal cells that change reflectivity in an applied electric field; used for portable computer displays and watches etc..

Digital display and liquid crystal display are semantically related. You can use "Digital display" instead a noun phrase "Liquid crystal display".