A TV that is 1080p can display images in true high definition. A 1080p TV has a resolution of 1920 pixels by 1080 pixels, which refers to the thousands of tiny squares displayed on screen at any given time. There are no other resolutions that are considered 1080p. Many TVs are advertised as supporting high-definition images, but not necessarily all of them support true high definition. There are TVs that support a resolution higher than that of a standard definition TV--720p, for example. They are technically "high definition," but only TVs that sport a resolution of 1080p are true high definition.
Check the box. Televisions with this kind of resolution are sought after, so if a TV is 1080p it will be prominently displayed on the packaging. Check the box for any reference to true high definition, such as "1920x1080" or "1080p."
Check the manual. The television's manual will also list all the technical specifications of the unit, right down to the smallest detail. The resolution of the screen will be among them.
Look up the model number on the manufacturer's website. The model number of your TV will be listed in the manual and on the rear of the TV itself. Go to the manufacturer's website, type in the model number and read the technical specifications. The website will state whether the TV is 1080p.