Mobile electronic devices are playing a more and more important role in people's daily life. Portable 3D display with thin and light characteristics has attracted wide attention. According to the application requirements of mobile information terminals, this paper mainly introduces the research progresses of four portable 3D display technologies, namely directional backlighting display, compressive light field display, integral imaging display, and directional light field display, and analyzes how to effectively utilize the display bandwidth according to the application scenes of portable devices. Finally, the future development of portable 3D display is prospected.