Pixel compensating circuit

A pixel compensation circuit includes: a light emitting diode; a driving unit connected to the light emitting diode and the first node; a control unit connected to the first node; the data writing unit is connected to the control unit; a reset unit connected to the first node; and the pull-down unit is connected to the control unit. The control unit is further used for controlling the voltage drop time of the first node according to the data voltage value received by the data write-in unit so as to adjust the gray scale of the light emitting diode. The data write-in unit includes a first transistor having a first end connected to a first voltage source and a second end connected to a second node; the first end of the second transistor is connected to the second node, and the second end is connected to the third node; the first end and the control end of the third transistor are connected to the third node, and the second end of the third transistor is connected to the data input source; the first end of the f