Semiconductor integrated circuit with voltage generation circuit, liquid crystal display controller and mobile electric equipment
US7317627B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 8, 2007 |
| Grant date | Jan 8, 2008 |
| Priority date | — |
| Expiry date | May 8, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M3/071
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
There is to be provided a liquid crystal drive controller with a built-in power supply circuit wherein latch-up is made difficult to arise even if one amplitude level of the segment line drive voltage is set to the ground potential and the levels of other liquid crystal drive voltages are determined accordingly. A semiconductor integrated circuit with a built-in power supply circuit, wherein a negative voltage generated in a power supply circuit is applied to a substrate or a well region as a bias voltage, is provided with a switch for temporarily applying the ground potential to the substrate or well region to be biased with the negative voltage at the time of starting up the power supply circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.