Pseudo static memory cell for digital light modulator
US6731272B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 22, 2001 |
| Grant date | May 4, 2004 |
| Priority date | — |
| Expiry date | May 10, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2300/0842
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A digital driver formed a liquid crystal uses a pseudo static memory cell formed of two transistors to hold the charge that will be applied to the different parts of the liquid crystal. The pseudo static memory is formed of two transistors, one of which is a pass transistor which passes the digital value and then goes into a high impedance date. The other transistor is a transistor configured to use its gate capacitance to store the charge. When the charge is above a specified level, it acts like a digital one and turns on the transistor. Conversely, when the charge is below level, it acts like a digital zero, turning off the transistor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.