GOA circuits and liquid crystal devices

A gate driver on array (GOA) circuit of liquid crystal devices (LCDs), comprising:

• a plurality of cascaded GOA units, each of the cascaded GOA units is configured for charging corresponding horizontal scanning lines within a display area when being driven by a first level clock, a second level clock, a first control clock, and a second control clock, the first level clock and the second level clock are configured for controlling an input of level signals of the GOA unit and for controlling generation of gate driving signals, the first control clock and the second control clock are configured for controlling the gate driving signals to be at a first level, and wherein the level signals are turn-on pulse signals or the gate driving signals of adjacent GOA units;
• and
• after the horizontal scanning lines have been charged completely by the GOA circuit, a control module is configured for resetting the gate driving signals, except for first gate driving signals, to be the first level via the turn-on pulse signals and a negative-voltage constant-voltage source, before the first gate driving signals are outputted, the horizontal scanning lines are prevented from generating redundant pulse signals, at the same time, load on a signal line of the turn-on pulse signals is decreased, the negative-voltage constant-voltage source is configured for providing constant low level signals for each of the GOA units;
• wherein the GOA unit comprises a forward-backward scanning unit, an input control unit, a pull-up maintaining unit, an output control unit, a GAS signal operation unit, and a bootstrap capacitance unit;
• the forward-backward scanning unit is configured for controlling a forward driven method or a backward driven method of the GOA circuit to maintain a common signal point at a second level in response to the first control clock or the second control clock;
• the input control unit is configured for charging the gate signal point after the first level clock controls an input of the level signals;
• the pull-up maintaining unit is configured for maintaining the gate signal point to be at the first level during a non-operation period in accordance with the common signal point;
• the output control unit controls the output of the gate driving signals corresponding to the gate signal point in accordance with the second level clock;
• the GAS signal operation unit controls the gate driving signals to be at the second level so as to charge the horizontal scanning line corresponding to the GOA unit;
• and
• the bootstrap capacitance unit lifts a voltage of the gate signal point;
• and
• wherein the control module comprises a plurality of first controllable transistors and a plurality of second controllable transistors corresponding to each of the GOA units one by one except for the first GOA unit, first ends of the first controllable transistors connect to the negative-voltage constant-voltage source, second ends of the first controllable transistors connect to a signal line of the turn-on pulse signals, third ends of the first controllable transistors connect to first ends and second ends of the second controllable transistors, and third ends of the second controllable transistors connect to the gate signal points of the corresponding GOA unit.