2D display(flat display) is currently the most widely used display method. From the earliest CRT televisions to giant screen cinemas, they all belong to 2D display technology.
3D display(autostereoscopic display) allows the images of 2D display devices to have depth information, making them look more three-dimensional and closer to reality.
Holographic display can view three-dimensional images from any angle. And because it is difficult to implement, it is also known as the crown in the field of display technology.