Patent ID: 8659612

Claim:
A control device for a display device that includes pixels in a plurality of rows and a plurality of columns, a first substrate having first electrodes each provided for each of the pixels, a second substrate having a second electrode, and display elements sandwiched between the first substrate and the second substrate, each of the pixels including the first electrode, the display element and the second electrode, and changes a display state of the pixel from a first display state to a second display state by a write operation of applying a voltage to the display element a plurality of times, the control device comprising: a selection section that sequentially selects the rows; a data read section that reads image data of an image to be displayed on the display device from a memory; a specifying section that specifies, based on scheduled image data representative of an image scheduled to be displayed on the display device before the data read section reads image data and the image data read by the data read section, changing pixels whose display state is to be newly changed among pixels in a row selected by the selection section; a boundary specifying section that specifies pixels among the pixels in the row selected by the selection section which are to be impressed with a voltage different from a voltage applied to pixels in an adjacent row, and specifies boundaries between the specified pixels and the pixels in the row adjacent to the specified pixels which are impressed with a voltage different from a voltage applied to the specified pixels; a boundary number memory section that stores a boundary number of the boundaries specified by the boundary specifying section at each of the rows; a judging section that judges as to whether or not the sum of the boundary numbers stored in the boundary number memory section is equal to or greater than a predetermined threshold value; and an update section that, when the judging section judges that the sum is less than the predetermined threshold value, starts the write operation with respect to the changing pixels to be changed to a display state defined by the image data if the changing pixels in the row selected by the selection section are not in the write operation, and starts the write operation with respect to the changing pixels to be changed to the display state defined by the image data after the ongoing write operation is finished if the changing pixels are in the write operation, and that, when the judging section judges that the sum is equal to or greater than the predetermined threshold value, does not start the write operation with respect to the changing pixels until the judging section judges that the sum is less than the threshold value.