Pixel circuit of organic electroluminescent display device and method of driving the same
US7978156B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 15, 2006 |
| Grant date | Jul 12, 2011 |
| Priority date | — |
| Expiry date | Jan 11, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2320/043
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A pixel circuit of an organic electroluminescent display device and a method of driving the same. In the pixel circuit, a capacitor has a first electrode connected to a gate of a driving transistor, and a second electrode connected to a drain of a switching transistor. Further, a compensation voltage applying transistor is connected to the second electrode of the capacitor. The compensation voltage applying transistor compensates for a difference in IR-drops of a power supply voltage in response to a previous emission control signal. Further, the compensation voltage applying transistor cuts off the compensation voltage in an initialization period, thereby preventing a source of a data voltage and a source of the compensation voltage from being shorted with each other. Additionally, a threshold voltage compensation transistor is connected between the gate and the drain of the driving transistor. Therefore, a difference in threshold voltages of driving transistors is compensated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.