Shift register circuit with high stability

Details Shift register circuit with high stability Shift register circuit with high stability

2007-10-23

2007-10-23

Lam, Tuan T (Department: 2816)

Electrical pulse counters, pulse dividers, or shift registers: c

Shift register

C377S068000

Reexamination Certificate

active

11186858

ABSTRACT:
A shift register circuit with high stability includes a plurality of stages, each including a supplementary unit for supplementing an output node with low voltage level. The present invention utilizes an output signal of the output node to feed back to a shift register circuit unit and act as a control signal. The control signal controls the shift register circuit unit, and further the output node of the shift register circuit unit is continuously supplemented with low voltage level. Thus, the shift register circuit of the present invention has the function of driving signal shift according to the necessity of active matrix liquid crystal panel. Furthermore, when an amorphous silicon thin film transistor is embodied in the shift register circuit, the present invention restrains the shift phenomena of the threshold voltage of the amorphous silicon thin film transistors and thereby increases the lifetime and stability of the shift register circuit.

REFERENCES:
patent: 5222082 (1993-06-01), Plus
patent: 5631940 (1997-05-01), Fujikura
patent: 6834095 (2004-12-01), Yu
patent: 6928135 (2005-08-01), Sasaki et al.
patent: 7027550 (2006-04-01), Lin
patent: 2005/0220262 (2005-10-01), Moon

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