Driving circuit and method for light emitting device
US6677713B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 25, 2002 |
| Grant date | Jan 13, 2004 |
| Priority date | — |
| Expiry date | Oct 25, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B45/60
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A driving circuit for a light-emitting device, having a driving, a first and a second transistor, and a maintaining capacitor. The light-emitting device is coupled to the driving transistor in series to form a light-emitting path. The on/off state of the driving transistor determines the conductance and on/off state of the light-emitting path. The first transistor has a source region coupled to the gate of the driving transistor and a gate coupled to a first scan line. The second transistor has a source region coupled to a reference low voltage, a drain region coupled to the gate of the driving transistor, and a gate coupled to a second scan line. The pulses of the first and second scan lines have the same frequency, while there is a delay time therebetween. The maintaining capacitor is coupled to the gate of the driving transistor to maintain a voltage state.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.