Patent ID: 7505301

Claim:
A display driver, comprising: a memory array having memory cells arranged in a matrix form defined by rows and columns, each of the memory cells being a Dynamic Random Access Memory (DRAM) cell in which a refresh operation is performed at a regular refresh period to maintain stored data; a drive control unit for generating a scan signal, a refresh signal and a write/read signal to control a scan operation in which data of the memory array is scanned and transmitted to a display panel in response to the scan signal, a refresh operation in which the memory array is refreshed in response to the refresh signal, and a write/read operation in which data of an external system is written/read into/from the memory cells in response to the write/read signal, respectively; a word line drive unit for providing a word line drive signal to the memory array, the word line drive signal activating a word line of corresponding one of the memory cells; and a data input/output unit for controlling input/output of data to/from the memory cells of the memory array, amplifying data of bit lines of the memory cells, forming a transmission path toward the external system during the write/read operation, and forming a transmission path toward the display panel during the scan operations, wherein the scan signal is activated in response to a first direction transition edge of a clock signal, and the refresh signal is activated in response to a second direction transition edge of the clock signal.