Patent ID: 7738622

Claim:
A shift register comprising: first to k-th clock transmission lines (k being an integer greater than 1) to transmit a first to k-th clock pulses with phase difference, each having a first pulse width, wherein the first to k-th clock pulses outputted in the adjoining periods are maintained as an overlapped active state of a predetermined time together; first to k-th reset clock transmission lines to transmit first to k-th reset clock pulses with phase difference, each having a second pulse width, wherein the i-th reset clock pulse (i being an integer of the first to k) is maintained in an active state at a period between a rising edge to the active state of the previously outputted i-th clock pulse and a rising edge to the active state of the subsequently outputted (i+1)-th clock pulse, and is changed to an inactive state within the overlapped active state of the predetermined time, and wherein the first pulse width is larger than the second pulse width; and first to m-th stages (m being an integer greater than 1) to receive one of the first to k-th clock pulses and one of the first to k-th reset clock pulses respectively from the-clock transmission lines and the reset clock transmission lines, and to output respective output signals in sequence, wherein the n-th stage (n being any integer from 1 to m) comprises: a noise eliminating unit to supply a start pulse externally provided or an output signal provided from the (n-p)-th stage (p being an integer smaller than the n) to an enable node according to the one of the first to k-th reset clock pulses; and a pull-up switching unit to receive the one of the first to k-th clock pulses and to output the n-th output signal according to a signal state of the enable node; a pull-down switching unit to maintain the n-th output signal substantially at a discharging voltage according to the other one of the first to k-th clock pulses which is delayed than the clock pulse supplied to the pull-up switching unit of the n-th stage; wherein each of the stages comprises a first switch which charges the enable node of the current stage in response to the start pulse externally provided or the output-signal provided from the preceding stage.