Column driver output amplifier with low quiescent power consumption for field emission display devices
US6147665A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 29, 1998 |
| Grant date | Nov 14, 2000 |
| Priority date | — |
| Expiry date | Sep 29, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2310/0291
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present invention provides for an amplifier circuit for use within a column driver of a field emission display (FED) device. In one embodiment of the present invention, the amplifier circuit has a high slew rate and a low quiescent current, and includes: an input for receiving an input voltage signal, an output for providing an output voltage signal, a voltage sensing circuit for monitoring a voltage differential between the input voltage signal and the output voltage signal, and a current-boosting circuit responsive to the voltage differential for providing additional bias current to the voltage sensing circuit to increase the slew rate of the output voltage signal. Significantly, the current-boosting circuit is inactive when the input voltage signal and the output voltage signal are substantially equivalent. In this way, bias current and power dissipation are maintained at a low level during quiescent conditions. In furtherance of the present embodiment, the input of the amplifier circuit is configured for coupling to D/A conversion circuits of the column driver to receive the input voltage signal, and the output of the amplifier circuit is configured for coupling to a column…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.