Liquid crystal display and bidirectional shift register apparatus thereof

A liquid crystal display (LCD), comprising:

• an LCD panel, comprising a substrate, a plurality of pixels arranged in an array, a first bidirectional shift register apparatus and a second bidirectional shift register apparatus, wherein the pixels, the first bidirectional shift register apparatus and the second bidirectional shift register apparatus are disposed on the substrate,
• wherein the first bidirectional shift register apparatus has N first shift registers collected in series and respectively corresponding to the pixels arranged in odd-numbered columns, and an ith first shift register comprises:
• a first pre-charge unit, receiving outputs of an (i−2)th and an (i+2)th first shift registers to output a first pre-charge signal when i is greater than or equal to 3 and less than or equal to N−2, wherein i is a predetermined positive integer, and wherein N is a predetermined positive integer,
• wherein the first pre-charge unit receives a first start pulse signal and the output of the (i+2)th first shift register to output the first 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)m first shift register to output the first pre-charge signal when i is equal to (N−I) or N;
• a first pull-up unit, coupled to the first pre-charge unit and receiving the first pre-charge signal and a first predetermined clock signal to output a first scan signal;
• and
• a first pull-down unit, coupled to the first pre-charge unit and the first pull-up unit and receiving the first pre-charge signal, a first level signal and a second level signal to control a level of the first scan signal,
• wherein the second bidirectional shift register apparatus has M second shift registers connected in series and respectively corresponding to the pixels arranged in even-numbered columns, and a jth second shift register comprises:
• a second pre-charge unit, receiving outputs of an (j−2)th and an (j+2)th second shift registers so as to output a second pre-charge signal when j is a positive integer which is greater than or equal to 3 and less than or equal to M−2, wherein M is a predetermined positive integer,
• wherein the second pre-charge unit receives a third start pulse signal and the output of the (j+2)th second shift register to output the second pre-charge signal when j is equal to 1 or 2 and receives a fourth start pulse signal and the output of the (j−2)th second shift register to output the second pre-charge signal when j is equal to (M−I) or M;
• and
• a second pull-up unit, coupled to the second pre-charge unit and receiving the second pre-charge signal and a second predetermined clock signal to output a second scan signal;
• and
• a second pull-down unit, coupled to the second pre-charge unit and the second pull-up unit and receiving the second pre-charge signal, a third level signal and a fourth level signal to control a level of the second scan signal;
• and a driving circuit, coupled to the LCD panel, configured to drive the LCD panel to display an image and providing a plurality of predetermined clock signals to serve as the first predetermined clock signal and the second predetermined clock signal;
• and
• a backlight module, configured to provide a light source for the LCD panel.