The invention relates to the technical field of optics, and discloses an optical structure, a control method thereof and a display device. The optical structure comprises a light dimming unit, an optical sensing unit and a control unit. The light dimming unit is divided into at least two sub-regions. Parameters related to the illumination intensity for illuminating each sub-region of the light dimming unit are obtained through the optical sensing unit, the control unit controls the light transmittance of the corresponding sub-region according to parameters related to the illumination intensity for illuminating each sub-region, the light transmittance of the optical structure can be automatically adjusted according to the illumination intensity, no manual adjustment is needed, and the user experience is improved. Meanwhile, region control is performed on the light dimming unit, it is ensured that the light transmittance of the whole light dimming unit is identical, and the better user experience can be obtained.