The invention discloses a
light sensing circuit and a driving method thereof, a display panel and a
display device, belonging to the technical field of display. The
light sensing circuit comprises that: the gate of a first
transistor is electrically connected to a first control terminal, the first pole is electrically connected to a first
voltage terminal, and the second pole is electrically connected to a first node; the gate of a second
transistor is electrically connected to the first node, the first pole is electrically connected to a second
voltage terminal, and the second pole is electrically connected to the first pole of a third
transistor; the gate of the third transistor is electrically connected to a second control terminal, and the second pole is electrically connected to a data line; the gate of a fourth transistor is electrically connected to a third control terminal, the first pole is coupled to the first node, and the second pole is electrically connected to a third
voltage terminal; the first transistor and the fourth transistor comprise active
layers formed of
metal oxide, and the fourth transistor is multiplexed into a
light sensing element; and the second transistor and the third transistor comprise active
layers formed of polysilicon. Compared with the prior art, the invention is advantageous to reduce the process steps and thin the display panel.