Negative step-up charge pump circuit, LCD driver IC, and...

Details Negative step-up charge pump circuit, LCD driver IC, and... Negative step-up charge pump circuit, LCD driver IC, and...

2007-03-19

2011-12-27

Shalwala, Bipin (Department: 2629)

Computer graphics processing and selective visual display system

Display driving control circuitry

Display power source

C345S204000, C327S157000

Reexamination Certificate

active

08085257

ABSTRACT:
In a negative step-up charge pump circuit according to the present invention, of a plurality of stages of charge transfer transistors and an output transistor, the former-stage transistors are P channel type field effect transistors, and the later-stage transistors are N channel type field effect transistors. With such configuration, it is possible to avoid start-up failure and current driving performance deterioration resulting from an increase in the number of stages of step-up units without complicating processes and increasing the chip size.

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