A transparent display panel and display apparatus are disclosed. The display apparatus includes: a first substrate; an optical waveguide member over the first substrate; a liquid crystal layer between the first substrate and the optical waveguide member, the transparent optical waveguide member having a light exit face facing towards the liquid crystal layer; a light source at a side surface of the optical waveguide member; light exit members distributed in an array on the light exit face of the optical waveguide member; and a photoluminescent layer on a side of the light exit members facing towards a light exit face of the display apparatus. The photoluminescent layer includes photoluminescent parts. A light entering the optical waveguide member exits through the light exit members, then enters the liquid crystal layer, and is controlled by the liquid crystal layer to irradiate the photoluminescent parts for performing a luminous display.