A display method and a display device of a display panel are provided, and belongs to the field of display technology. The display panel of the disclosure includes a light emitting device and a light sensing device. Each light sensing device is used for sensing the light emitted by at least one light emitting device. The display data of each light emitting device in the display panel is obtained according to a target brightness value and a brightness compensation gain value. The method includes: in a sensing stage, obtaining an actual brightness value of the light emitting device to be compensated according to the sensing data generated by the light sensing device, and setting a brightness compensation gain of the light emitting device to be compensated according to at least the obtained actual brightness value and the target brightness value.