The invention relates to an optical interference and
diffraction based
holographic display device of a showcase. The
display device comprises a bearing rack, separator plates, coated glass, a projection rack, cameras, at least one
LED display, projection imaging glass, a holographic projection film, illuminating lamps, a
projector, a supporting
desk, a rotary table mechanism and a
control system; and the bearing rack is divided into a
holographic imaging cavity, a projection cavity and a bearing cavity from top to bottom by the separator plates, the supporting
desk is embedded into the bottom of the bearing cavity via the rotary table mechanism, the cameras are distributed uniformly surrounding the supporting
desk, the
projector is mounted in the bottom of the projection cavity, the illuminating lamps are distributed uniformly surrounding the
optical axis of the
projector, the projection imaging glass is embedded into the separator plate between contact surfaces of the projection cavity and the bearing cavity, different coated glass is connected mutually via the projection rack, and the
LED display is embedded into the upper end of the
holographic imaging cavity. According to the invention, the requirement of optical
holographic imaging display of information which needs displaying can be met, and an object which needs displaying can be displayed comprehensively and flexibly in different angles in the holographic information display process.