System and method for providing bias voltages to pad logic of an LCD controller
US8274466B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 4, 2009 |
| Grant date | Sep 25, 2012 |
| Priority date | — |
| Expiry date | Jul 2, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2330/022
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An LCD controller includes at least one I/O pad for providing an LCD drive voltage in an LCD mode of operation. I/O pad logic drives the at least one I/O pad responsive to a provided bias voltage. Voltage selection logic selects a higher voltage between an LCD drive voltage and an externally provided system voltage as a first voltage. Bias voltage logic selects one of the system voltage or the first voltage as the bias voltage for the I/O pad logic. The system voltage is selected as the bias voltage for the I/O pad logic in a non-LCD mode of operation for the I/O pad and the first voltage is selected for the bias voltage for the I/O pad logic in the LCD mode of operation for the I/O pad.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.