Pulse output circuit, shift register and electronic equipment

Details Pulse output circuit, shift register and electronic equipment Pulse output circuit, shift register and electronic equipment

2006-10-03

2006-10-03

Lam, Tuan T. (Department: 2816)

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

Shift register

Particular transfer means

C377S078000, C345S100000

Reexamination Certificate

active

07116748

ABSTRACT:
A driver circuit of a display device, which includes TFTs of a single conductivity type and outputs an output signal with normal amplitude. A pulse is inputted to TFTs101and104to turn ON the TFTs and a potential of a node α is raised. When the potential of the node α reaches (VDD−VthN), the node α becomes in a floating state. Accordingly, a TFT105is turned ON and a potential of an output node is raised as a clock signal becomes High level. On the other hand, a potential of a gate electrode of the TFT105is further raised due to an operation of a capacitance means107as the potential of the output node is raised, so that the potential of the gate electrode of the TFT105becomes higher than (VDD+VthN). Thus, the potential of the output node is raised to VDD without causing a voltage drop due to a threshold voltage of the TFT105.An output at the subsequent stage is then inputted to a TFT103to turn the TFT103ON, while the potential of the node α of TFTs102and106is dropped to turn the TFT105OFF. As a result, the potential of the output node becomes Low level.

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