Optical display device having a memory to enhance refresh operations
US7170485B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 28, 2000 |
| Grant date | Jan 30, 2007 |
| Priority date | — |
| Expiry date | Oct 2, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2300/0842
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method includes providing a capacitor to maintain a terminal voltage of a pixel cell near a predetermined voltage. A memory is provided to store a digital indication of the predetermined voltage, and during a refresh operation, the digital indication is converter into an analog voltage to update a charge on the capacitor. A light modulator cell includes a pixel cell, a capacitor, a memory and a digital-to-analog converter. The capacitor maintains a terminal voltage of the pixel cell near a predetermined voltage, and the memory stores a digital indication of the predetermined voltage. The digital-to-analog converter converts the digital indication into an analog voltage to update a charge on the capacitor during a refresh operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.