The invention discloses a light sensing film, a display panel and a method for detecting the bending state of the display panel. The light sensing film comprises a light sensing unit, a signal receiving unit electrically connected with one end of the light sensing unit and a signal output unit electrically connected with the other end of the light sensing unit, wherein the light sensing unit is configured to generate a sensing state corresponding to the polarization state of light passing through the light sensing unit, so that the signal output unit outputs an electric signal corresponding tothe polarization state of the light. The display panel comprises a display substrate and a photo-sensing film disposed on one side of the display substrate. The method for detecting the bending stateof the display panel realizes the detection of the bending state of the display panel, and the display panel can react according to the stressed bending state of the display panel, so that the display mode of the display panel corresponds to the bending state, the display effect of the display panel is improved, and the application range and the field of the flexible display panel are widened.