Power source circuit, power source for driving a liquid crystal display, and a liquid crystal display device
US6188395A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 30, 1996 |
| Grant date | Feb 13, 2001 |
| Priority date | — |
| Expiry date | Aug 30, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2330/021
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A power source circuit which is suitable as a power source for use in driving a liquid crystal display, wherein on the basis of the power source electric potentials (VDD, VEE), the voltage is divided by voltage dividing resistors (R1 to R5), and passes through operational amplifiers (OP1 to OP4) that comprise voltage followers, so that output electric potentials (V1 to V5) are output. The power source electric potential (VDD) and the intermediate electric potential (Va) which is output from a voltage dividing circuit (S) are supplied to the operational amplifiers (OP1, OP2), and the intermediate electric potential (Va) and the power source electric potential (VEE) are supplied to the operational amplifiers (OP3, OP4). In the voltage dividing circuit (S), a parallel circuit component comprising a large resistors (R12) and a condenser (C5) and a parallel circuit component comprising a large resistor (R13) and a condenser (C6) are connected in series between the power source electric potential (VDD) and the power source electric potential (VEE), and the intermediate electric potential (Va) is output from the point of connection of these two parallel circuit components.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.