Constant current driver with auto-clamped pre-charge function
US6323631A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 18, 2001 |
| Grant date | Nov 27, 2001 |
| Priority date | — |
| Expiry date | Jan 18, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2320/0252
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A constant current driver with auto-clamped pre-charge function includes a reference bias generator and a plurality of constant current driver cells, each being connected to the reference bias generator to form a respective current mirror. Each constant current driver cell has a switch transistor, a current output transistor and a pre-charge transistor. When a constant current is outputted from the current output transistor for driving an organic light emitting diode, the pre-charge transistor is turned on to provide a drain to source current as an additional large current for rapidly pre-charging the organic light emitting diode until the gate to source voltage of the pre-charge transistor is smaller than the threshold voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.