High-reliability shift register circuit

Details High-reliability shift register circuit High-reliability shift register circuit

2005-11-29

2005-11-29

Wambach, Margaret R. (Department: 2816)

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

Shift register

Shift direction control

C345S099000, C345S100000

Reexamination Certificate

active

06970530

ABSTRACT:
The main circuit of each stage of the high-reliability shift register circuit is composed of transistors, and the turn-on time for the four transistors are only 1˜2 pulse time within one frame time. Transistors construct an inverter circuit which continuously offers a high-level supply voltage that controls activities of transistors so as to continuously offer a low-level supply voltage to the first node and the output terminal such that avoids the first node and the output terminal being in a floating state. Besides, one of the transistor acts as a charging circuit that extends the lifetime of another transistor. This circuit avoids the affection on the behavior of the shift register circuit that is caused by an a-Si (amorphous silicon) TFT under a sustained stress.

REFERENCES:
patent: 3937984 (1976-02-01), Fry
patent: 4598214 (1986-07-01), Sexton
patent: 5222082 (1993-06-01), Plus
patent: 5227674 (1993-07-01), Takahashi et al.

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