Shift register apparatus
AssigneeAu Optronics Corporation
InventorsYi-Suei Liao, Chien-Liang Chen, Chen-Lun Chiu, Hao-Chieh Lee, Kuan-Yu Chen
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Abstract
A shift register apparatus is provided. The pull-down unit of each of the shift registers in the shift register apparatus is controlled by itself, previous, and next two shift registers to enhance the ability of pull-down and voltage regulating. Therefore, the circuit structure of each of the shift registers does not need to be designed a large compensation capacitor therein to substantially restrain the coupling noise effect caused by the clock signal, and thus permitting that each of the shift registers can be collocated with a small compensation capacitor to enhance the output capability thereof.
Claims13
A shift register apparatus, comprising:
- a plurality of shift registers connected in series, each of the shift registers comprising a pull-up unit, a control unit and a pull-down, wherein:
- the pull-up unit of the ith shift register correspondingly receives a clock signal and a first scan signal outputted from the (i−1)th shift register, and provides a pull-up signal accordingly and determines whether a second scan signal is outputted or not;
- the control unit of the ith shift register receives the clock signal and the pull-up signal, and outputs a second control signal accordingly;
- and
- the pull-down unit of the ith shift register is coupled to the pull-up unit and the control unit of the ith shift register and the control unit of the (i−1)th shift register, for receiving and controlled by the second control signal, a first control signal outputted from the control unit of the (i−1)th shift register, and a fourth scan signal outputted from the (i+2)th shift register, wherein when the ith shift register does not output the second scan signal, the ith shift register stably outputs a reference voltage by the pull-down unit of the ith shift register, where i is a positive integer which, is greater than or equal to 2.
Dependencies are inferred from the claim text.