Patent ID: 8665253

Claim:
A control apparatus of an electro-optic apparatus having a display unit which has a plurality of pixels, and in which writing is performed in order to change a display state of each of the pixels from a first display state to a second display state by applying a voltage more than once, the display unit having a plurality of regions the control apparatus comprising: a writing region determination unit which obtains an access flag indicative of whether the writing operation is performed on pixels in each of the regions from a storage unit storing the access flag for each of the regions, and which determines whether to perform the writing operation on the pixels included in a region corresponding to the obtained access flag based on the access flag; a writing state determination unit which, with respect to the pixels included in the region on which the writing region determination unit determined to perform the writing operation, compares image data written in a memory with estimated image data indicative of an estimated image to be displayed on the corresponding display unit by performing the writing operation in progress, and determines whether a previous writing operation is being performed on the pixels when a new writing operation is necessary; a writing control unit which starts to perform the new writing operation on the pixels when the writing state determination unit determines that the writing operation is not in progress on the pixels, continues the writing operation in progress when the writing state determination unit determines that the writing operation is in progress on the pixels, and then starts the new writing operation after the writing operation in the progress is terminated; and a flag state change unit which changes a state of the access flag corresponding to the relevant region to a state in which the writing operation is not necessary when the writing operation performed on all pixels included in the region is terminated.