A processing method for a device having a bi-stable display includes transforming a target page to be turned to; calculating overlap between the transformed target page and a current page; and determining whether the overlap of the transformed page complies with a predetermined criterion. In the preferred embodiment, the three panels are pivotally secured by a living hinge system. The signal charge collecting region is disposed at a center portion of the pixel region and inside the charge generating region so as to be surrounded by the charge generating region. When the determined color does not correspond to the first correction characteristic, the PC performs gamma correction of the received image data in accordance with the inverse characteristic of the first correction characteristic and then performs gamma correction using the second correction characteristic corresponding to the determined color.