Display device and display method

The invention relates to a display device and a display method. The display device comprises a signal source, a plurality of transparent display units and a layer-by-layer scanning circuit. The signal source is configured to provide a plurality of depth images based on the same 3D image, and the depth ranges of the depth images are different. The transparent display units are configured to emit imaging light rays in the same direction and are sequentially arranged at intervals in the same direction. The layer-by-layer scanning circuit is configured to input the depth images into the transparent display units respectively and control the transparent display units on the display side to be in a transparent state in the process that the transparent display units display the input depth images. The display device can reduce power consumption of 3D display. 种显示装置和显示方法，该显示装置包括：信号源，其配置为提供基于同3D图像的多个深度图像，所述多个深度图像的深度范围不同；多个透明显示单元，配置为沿同方向发射成像光线且沿所述同方向依次间隔设置；以及逐层扫描电路，其配置为将所述多个深度图像分别输入给所述多个透明显示单元，并且在每个透明显示单元显示被输入的深度图像的过程中