LIQUID CRYSTAL DISPLAY AND BIDIRECTIONAL SHIFT REGISTER DEVICE THEREOF

摘要

A liquid crystal display and its bidirectional shift register device including N stages of shift registers are provided. An ith stage shift register of the shift registers includes a pre-charge unit, a pull-up unit and a pull-down unit. The pre-charge unit outputs a pre-charge signal according to outputs of (i−2)th and (i+2)th stage shift registers. The pull-up unit outputs a scan signal. A first discharge unit of the pull-down unit determines whether to pull the scan signal down to a reference voltage potential according to the pre-charge signal and a first voltage-dividing signal associated with a first level signal. A second discharge unit of the pull-down unit determines whether to pull the scan signal down to the reference voltage potential according to the pre-charge signal and a second voltage-dividing signal associated with a second level signal.

主权项

1. A bidirectional shift register device, comprising:
N stages of shift registers connected together in series, wherein an ith stage shift register of the shift registers comprises:
a pre-charge unit receiving an output of an (i−2)th stage shift register and an output of an (i+2)th stage shift register of the shift registers and outputting a pre-charge signal according to the outputs of the (i−2)th and (i+2)th stage shift registers, wherein N is a predetermined positive integer, and i is a positive integer larger than or equal to 3 and smaller than or equal to N−2;a pull-up unit coupled to the pre-charge unit, the pull-up unit receiving the pre-charge signal and a predetermined clock signal and outputting a scan signal according to the pre-charge signal and the predetermined clock signal; anda pull-down unit coupled to the pre-charge unit and the pull-up unit, the pull-down unit comprising:
a first discharge unit receiving the pre-charge signal and a first level signal and determining whether to pull the scan signal down to a reference voltage potential according to the pre-charge signal and a first voltage-dividing signal associated with the first level signal; anda second discharge unit receiving the pre-charge signal and a second level signal and determining whether to pull the scan signal down to the reference voltage potential according to the pre-charge signal and a second voltage-dividing signal associated with the second level signal.