Abstract: A driver includes a first memory including a plurality of memory cells and redundant memory cells. An address control circuit replaces a defective memory cell of the plurality of memory cells with one of the redundant memory cells based on a defect address data indicating an address of the defective memory cell. A driving circuit displays on a display panel, a display data stored in the first memory based on a display quality specifying data specifying display quality of the display panel. The display quality specifying data and the defect address data are stored in a second memory.

Abstract: A memory device includes a memory cell block, a reference cell block and a comparator. The memory cell block includes a plurality of cells, and a memory bit line is connected to a selected one of the cells. The reference cell block includes a plurality of cells, and a reference bit line is connected to a predetermined number of cells which are connected in series. The comparator compares a memory signal received from the memory bit line to a reference signal received from the reference bit line to determine a bit data of the selected cell.