Organic EL drive circuit and organic EL display device using the same
US6992647B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 10, 2003 |
| Grant date | Jan 31, 2006 |
| Priority date | — |
| Expiry date | Nov 12, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M1/745
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An input side drive current of a D/A converter circuit is controlled by a switch circuit connected in series with at least one of a plurality of input side transistors connected in parallel to form a current mirror connection. By turning the switch circuit from ON to OFF, a constant current flowing through the input side transistor, which is turned OFF by the switch circuit, is distributed to the remaining input side transistors, resulting in a large D/A converted current in a current mirror connected output side transistor. Thus, it is possible to correspondingly reduce a value of a display data, so that the number of bit positions of the D/A converter circuit can be reduced by 1 or more.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.