Au Optronics Corporation

Je-Hao Hsu

Lee-Hsun Chang

Wen-Pin Chen

Chiu-Mei Yu

A shift register of an LCD device operates based on two clock signals and maintains the gate voltage of an output transistor switch using two pull-down transistor switches. The gate voltages of the pull-down transistor switches are switched periodically between the high and low level of the clock signals. During the output period, the transistor switches have negative gate-source voltages so as to reduce leakage.

Shift register and a liquid crystal display device having the same

In a display device and a repairing method therefor, the display device includes a gate line and two gate-on-array circuits arranged at two sides thereof. Each of the gate-on-array circuits includes a stage coupled to the gate line. Each the stage includes a transistor and a repair circuit. The first source/drain electrode of the transistor is coupled to the gate line, and the second source/drain electrode of the transistor is coupled to receive a clock pulse signal. The repair circuit includes a first terminal coupled to the gate electrode of the transistor, a second terminal coupled to a predetermined potential, and at least one control terminal adapted to receive at least one repair signal to pull the potential on the gate electrode of the transistor to the predetermined potential. The transistor maintains at off-state when the at least one repair signal is supplied to the repair circuit.

Display device and repairing method therefor

A gate driving circuit having a low leakage current control mechanism is disclosed for providing a plurality of gate signals forwarded to a plurality of gate lines respectively. The gate driving circuit includes a plurality of shift registers. Each shift register includes a driving unit, an energy store unit, a buffer unit, a voltage regulation unit, and a control unit. The driving unit generates a gate signal based on a driving control voltage and a first clock. The buffer unit functions to receive a start pulse signal. The energy store unit provides the driving control voltage through performing a charging process based on the start pulse signal. The control unit generates a control signal based on the first clock and a second clock having a phase opposite to the first clock. The voltage regulation unit regulates the driving control voltage based on the control signal.

Gate driving circuit having a low leakage current control mechanism

A shift register includes a plurality of stages cascade-connected with each other. Each stage includes a pull-up circuit, a pull-up driving circuit, and a pull-down circuit. The pull-up circuit coupled to a first clock signal is used for providing an output signal. The pull-up driving circuit includes a control circuit and a first transistor. The control circuit has a gate coupled to a previous stage, and a drain coupled to a second clock signal. The first transistor includes a gate coupled to the source of the control circuit, a drain coupled to a driving end of the previous stage, and a source coupled to a first input end. The pull-down circuit pulls down voltage on the first input end.

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Hsin-Chu, Taiwan

Je-Hao Hsu