Patent ID: 7495639

Claim:
A power-saving and efficient driving method for driving a matrix of light emitting diodes arrayed in rows and columns, and a Dis-Charge phase, a Pre-Charge phase, a Current-On phase, and a Floating phase are for each column, and a Current-Sink phase, the Floating phase, and a Reverse-Bias phase are for each row, the method comprising the steps of: (A) executing the Dis-Charge phase for a first predetermined time, the Pre-Charge phase for a second predetermined time, the Current-On phase for a third predetermined time, and the Dis-Charge phase for a fourth predetermined time in successive for an active column; (B) executing the Dis-Charge phase for the first predetermined time, the Floating phase for the second predetermined time, the Dis-Charge phase for the third predetermined time, and the Dis-Charge phase for the fourth predetermined time in successive for a non-active column; (C) executing the Current-Sink phase for the first predetermined time, the Current-Sink phase for the second predetermined time, the Current-Sink phase for a third predetermined time, and the Current-Sink phase for the fourth predetermined time in successive for an active row; and (D) executing the Floating phase for a first predetermined time, the Floating phase for the second predetermined time, the Reverse-Bias phase for the third predetermined time, and the Floating phase in the fourth predetermined time in successive for a non-active row; and wherein the fourth predetermined time is longer than the first predetermined time, the second predetermined time, and the third predetermined time.