A display module capable of achieving a conversion between 2D display and 3D display, comprises a display panel and a light modulating component. The display panel comprises a plurality of pixels, each of which comprises three first sub-pixels arranged in a triangular pattern. All of the first sub-pixels are arranged in a plurality of rows in a first direction and in a plurality of rows in a second direction which is substantially perpendicular to the first direction, and the first sub-pixels in each row are arranged at intervals. The light modulating component comprises a first light modulating unit configured to adjust transmittance of light emitted to the left eye by the respective first sub-pixels of the display panel and a second light modulating unit configured to adjust transmittance of light emitted to the right eye by the respective first sub-pixels of the display panel. A display device and a driving method thereof are further disclosed.