Systems and techniques are disclosed relating to shifting a plurality of input data bits to the left or right by a number of bit positions as a function of a binary value of a plurality of shift control bits. A first shifter element may be configured to perform one of two shifting operations on the input data bits to produce a plurality of first output bits, a first one of the shift control bits being used to select the shifting operation performed by the first shifter element. A second shifter element may be configured to perform at least one shifting operation on the first output bits to produce a plurality of second output bits, each of said at least one shifting operation being selectable from two shifting operations, a different one of the shift control bits being used to select each of said at least one shifting operation performed by the second shifter element. A third shifter element may be configured to perform one of two shifting operations on the second output bits, a second one of the shift control bits being used to select the shifting operation performed by the third shifter element.

An image display device, a scan line drive circuit and a driver circuit for the display device capable of driving the display device having a multiplex pixel structure by simple control and utilizing a simplified gate driver. The image display device includes a plurality of pixel electrodes, a plurality of scan lines G for supplying scan signals to turn on and off these pixel electrodes, a pulse generator for generating a shift pulse, buffers B provided corresponding to the respective scan lines G, and a shift register unit in which first and second shift registers SR1 and SR2 are alternately cascade-connected. The shift pulse is propagated through the first and the second shift registers SR1 and SR2 by outputting the shift pulse from the pulse generator to the shift register unit. In this way, the shift pulse is controlled to be propagated between a buffer B to an adjacent buffer B in one horizontal scanning cycle.