Patent ID: 7692620

Claim:
A display comprising a shift register circuit including: a first shift register circuit portion outputting a first shift signal; a second shift register circuit portion arranged subsequently to said first shift register circuit portion for outputting a second shift signal; and a logic composition circuit portion, constituted of a plurality of first conductive type transistors turned on with a first voltage supply source, receiving said first shift signal and said second shift signal and outputting a shift output signal by logically compositing said first shift signal and said second shift signal with each other, wherein at least either said first shift register circuit portion or said second shift register circuit portion includes a reset transistor for resetting the voltage supply source of a node outputting said first shift signal or said second shift signal to a second voltage supply source not turning on said transistors of said logic composition circuit portion in response to a prescribed drive signal wherein said prescribed drive signal is a start signal for starting scanning by said shift register circuit, and wherein said transistors of said logic composition circuit portion include: a second transistor having either the source or the drain connected to a first signal line supplying a first signal switched between said first voltage supply source and said second voltage supply source with the gate receiving said first shift signal, and a third transistor having either the source or the drain connected to either the drain or the source of said second transistor with the gate receiving said second shift signal, so that the display outputs said shift output signal of said first voltage supply source through said second transistor and said third transistor by turning on said second transistor and said third transistor and supplying said first signal of said first voltage supply source to either the source or the drain of said second transistor from said first signal line when said first shift signal and said second shift signal are at said first voltage supply source, and outputs said shift output signal of said second voltage supply source through said second transistor and said third transistor by supplying said first signal of said second voltage supply source to either the source or the drain of said second transistor from said first signal line when changing said first shift signal from said first voltage supply source to said second voltage supply source.