  The cuprate superconductors exhibit ubiquitous instabilities toward
charge-ordered states. These unusual electronic states break the spatial
symmetries of the host crystal, and have been widely appreciated as essential
ingredients for constructing a theory for high-temperature superconductivity in
cuprates. Here we report real-space imaging of the doping-dependent charge
orders in the epitaxial thin films of a canonical cuprate compound La2-xSrxCuO4
using scanning tunneling microscopy. As the films are moderately doped, we
observe a crossover from incommensurate to commensurate (4a0, where a0 is the
Cu-O-Cu distance) stripes. Furthermore, at lower and higher doping levels, the
charge orders occur in the form of distorted Wigner crystal and grid phase of
crossed vertical and horizontal stripes. We discuss how the charge orders are
stabilized, and their interplay with superconductivity.
