An active-matrix display device has a gate driver for driving a plurality of gate bus lines of a display portion in accordance with a multi-phase gate clock signal. The gate driver includes first and second gate drivers disposed to opposite sides of the display portion. Each of the first and second gate drivers includes a plurality of buffer circuits connected to the gate bus lines and a plurality of bistable circuits cascaded together so as to constitute a shift register. Each bistable circuit controls two buffer circuits. The bistable circuits are disposed in an interlaced arrangement between the first and second gate drivers. Each of the two buffer circuits controlled by each bistable circuit includes a boost capacitor, and one of the two buffer circuits includes a transistor for isolating a boost effect.