LIQUID CRYSTAL DISPLAY AND BIDIRECTIONAL SHIFT REGISTER APPARATUS THEREOF

摘要

An LCD and bidirectional shift register apparatuses thereof are provided. One of the bidirectional shift register apparatuses includes Nth shift registers. An ith shift register includes a pre-charge unit, a pull-up unit and a pull-down unit. When i is greater than or equal to 3 and less than or equal to N−2, the pre-charge unit receives outputs of an (i−2)th and an (i+2)th shift register. When i is equal to 1 or 2, the pre-charge unit receives a first start pulse signal and the output of the (i+2)th shift register. When i is equal to (N−1) or N, the pre-charge unit receives a second start pulse signal and the output of the (i−2)th shift register. The pre-charge unit outputs a pre-charge signal. The pull-up unit outputs a scan signal. The pull-down unit receives the pre-charge signal to control a level of the scan signal.

主权项

1. A bidirectional shift register apparatus, comprising: N shift registers, connected in series, and an ith shift register of the N shift registers comprising:
a pre-charge unit, receiving outputs of an (i−2)th and an (i+2)th shift registers to output a pre-charge signal when i is greater than or equal to 3 and less than or equal to N−2, wherein the pre-charge unit receives a first start pulse signal and the output of the (i+2)th shift register to output the pre-charge signal when i is equal to 1 or 2 and receives a second start pulse signal and the output of the (i−2)th shift register to output the pre-charge signal when i is equal to (N−1) or N, wherein N is a predetermined positive integer; a pull-up unit, coupled to the pre-charge unit and receiving the pre-charge signal and a predetermined clock signal to output a scan signal; and a pull-down unit, coupled to the pre-charge unit and the pull-up unit, receiving the pre-charge signal, a first level signal and a second level signal to control a level of the scan signal.