CIRCUIT, DRIVER CIRCUIT, ORGANIC ELECTROLUMINESCENT DISPLAY DEVICE ELECTRO-OPTICAL DEVICE, ELECTRONIC APPARATUS, METHOD OF CONTROLLING THE CURRENT SUPPLY TO AN ORGANIC ELECTROLUMINESCENT PIXEL, AND METHOD FOR DRIVING A CIRCUIT
US6943759B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 9, 2001 |
| Grant date | Sep 13, 2005 |
| Priority date | — |
| Expiry date | Aug 1, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2320/0252
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A driver circuit operating in stages that comprise a programming stage and a reproduction stage, the circuit comprising: a plurality current paths each of which passes through the circuit, a current driven element, a transistor connected so as operatively to control the current supplied to the said element, a capacitor connected for storing an operating voltage of the transistor during the programming stage, and switching means which control the current paths, the arrangement being such that one of the current paths does not include the said element. No current is applied to the current driven element by the current controlling transistor during the programming stage and thus the overall power consumption is reduced. Furthermore, the circuit can be operated from a normal supply voltage rather than requiring a high bias voltage. During the programming stage, the circuit uses a current sink rather than a current source. Preferably, the current driven element is an electroluminescent element.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.